Default File Type Associations - Restore

Restore Default Windows 7 File Extension Type Associations​

   Information

The downloads below will allow you to restore the Windows 7 default registry entries and program associations of the selected file extension type.

   Note

This can be helpful for example when a file extension type opens with the wrong program by default, has the wrong icon, or is missing or corrupted in the registry. Downloading the .reg file for the selected file extension in the tutorial below, will restore that file extension back to default for all of these items above.

Since there are so many default file extension types in Windows 7, it may take a bit to have a complete list of them below. If the file extension type you need to restore is not listed below yet, then please post a request for it. I'll be happy to add it to the list.

   Warning

Default program associations for file extensions are a per user setting by default, so you will need to be logged on to the effected user account to be able to restore the default associations of the file extension for that specific user account.

If you are logged in as a standard user and this still does not help, then have the administrator also merge the needed .reg for the file extension below while logged into their administrator account.

These default file extensions should only be used in Windows 7.

:note: For Windows 10, please see here - Restore Default File Type Associations in Windows 10 - Windows 10 Customization Tutorials


Here's How:
1. Click on a listed file extension below the blue NOTE box that you would like to restore the default associations of. This will be for the downloadable .reg file for the listed file extension.

2. Save the .reg file to your desktop.

3. Right click on the downloaded .reg file, and click on Merge.
NOTE: If you wish to see what changes will be made by the REG file, then you can right click on the extracted REG file and click on Edit to see the default registry entries that will be added. REG files are just text files. The "Edit" function just opens them in Notepad.

   Tip

If you do not see a Merge option when you right click on the REG file, then you will need to check in Default Programs to set the reg file extension to have it's Current Default program set as Registry Editor (C:\Windows\regedit.exe). Afterwards, try merging the REG file again.

4. If prompted, click on Run, Yes (UAC), Yes, and OK.
NOTE: If you are logged in a standard user account, then you will get a Cannot import type error. Just click on OK for it. This is normal since what cannot be imported can only be done so by an administrator account instead. It will still restore the default association of the file extension though.

5. When finished, you can delete the downloaded .zip or .reg files on the desktop if you like.

6. Log off and log on, or restart the computer to apply.




Default Windows 7 File Extension Types:

   Note

To download all available file extension fixes below in one ZIP folder, click on the Download button below and save the ZIP file to your desktop. Open the ZIP file, and extract (drag and drop) the REG file for the file extension you want to restore to your desktop. Now you could just pick up at step 3 above.


Download

3GP - Audio and video container format developed by the 3rd Generation Partnership Project (3GPP); designed as a multimedia format for transmitting audio and video files between 3G cell phones and over the Internet; commonly used by mobile phones that support video capture. The default program is Windows Media Player.

3GPP - Audio and video container format developed by the 3rd Generation Partnership Project (3GPP); designed as a multimedia format for transmitting audio and video files between 3G cell phones and over the Internet; commonly used by mobile phones that support video capture. The default program is Windows Media Player.

aac - ADTS audio file. The default program is Windows Media Player.

ai - AI file.

ani - Windows animated cursor file.

aspx - A file with the ASPX file extension is an ASP.NET Source file.

asf - Advanced Streaming Format (ASF) is an open file format specification for streaming multimedia files containing text, graphics, sound, video, and animation. The default program is Windows Media Player.

asx - Advanced Stream Redirector (.asx) play list files, also known as Windows Media Metafiles, are text files that provide information about a file stream and its presentation. The default program is Windows Media Player.

AudioCD - Audio CD protocol associations.

avi - Audio Video Interleave files. The default program is Windows Media Player.

bas - BASIC source code file.

bak - Usually used to rename a file extension with to make it a backup copy. bak as no associations by default, so this will remove all associations for the bak file extension.

bat - Batch files.

bin - Binary file. By default in Windows 7, .bin files are not associated to be opened by a default program.

bmp - Bitmap image files. The default program is Windows Photo Viewer.

Briefcase - New Briefcase file.

cab - Cabinet files.

cer - Security Certificate file

chm - Microsoft compiled HTML help files.

cmd - Windows command script files.

com - MS-DOS application files.

Contact - Contact file. Default program is Windows Contacts.

cpl - Control Panel item.

cpp - Program source code written in the C++ programming language; may be a standalone program or one of many files referenced within a programming project; can be viewed with a text editor, but most software development programs will display the text with helpful syntax highlighting

crl - Certificate Revocation list file

crt - Security Certificate file

css - Cascading Style Sheet Document file. The default program is Notepad.

cur - Windows File Cursor animation files used for the Microsoft Windows mouse pointer image.

dat - Generic data file created by a specific application; typically accessed only by the application that created the file; may contain data in text or binary format; text-based DAT files can be viewed in a text editor.

der - Security Certificate file

db - Data base file.

dic - The .DIC file extension is a Dictionary file (text file) which can be used as an alternate dictionary on top of the Microsoft Windows Dictionary and may contain an optional set of personalized words which the user has opted to add for spell- checking purposes.

Directory - Directory protocol associations

dll - A Dynamic Link Library (dll) file is a support file used by one or more programs.

drive - Drive protocol associations.

dvr-ms - Microsoft Recorded TV Show file. The default program is Windows Media Center.

exe - Executable application files.

folder - Folder protocol associations.

gif - GIF (Graphics Interchange Format) image files. The default program is Internet Explorer.

gz - Usually associated with Gzip. By default, there is no associated program for this in Windows 7.

h - C or C++ program language header file normally with .C or .CPP file. In computer programming, particularly in the C and C++ programming languages, a header file or include file is a file, usually in the form of source code, that is automatically included in another source file by the compiler. Typically, header files are included via compiler directives at the beginning (or head) of the other source file.

hlp - Help file

hta - HTML (Hypertext Mark-up Language) application. The default program is Microsoft (R) HTML Application host (mshta.exe)

htm - HTML (Hypertext Mark-up Language) document files. The default program is Internet Explorer.

html - HTML (Hypertext Mark-up Language) document files. The default program is Internet Explorer.

ico - Icon files. The default program is Windows Photo Viewer.

img - CD or DVD image file, essentially equivalent to an ISO file.

inf - Setup information files. The default program is Notepad.

ini - The INI file type is primarily associated with 'Initialization/Configuration File'. These files are typically ASCII text with various configuration options set into sections.

iso - Image file.

jnt - Journal document file. Default program is Windows Journal.

jpe - JPEG (Joint Photographic Experts Group) image files. The default program is Windows Photo Viewer.

jpeg - JPEG (Joint Photographic Experts Group) image files. The default program is Windows Photo Viewer.

jpg - JPG (Joint Photographic Group) image files. The default program is Windows Photo Viewer.

js - Java Script file. The default program is Microsoft Windows Based Script Host (C:\Windows\System32\wscript.exe).

JSE - JScript encoded script file. The default program is Microsoft Windows Based Script Host (C:\Windows\System32\wscript.exe).

library-ms - Library folder.
NOTE: To restore the default icons, you may need to do these as well.

• How to Change a Library Icon in Windows 7
• How to Change the Default Libraries Icon in Windows 7

lnk - Shortcut link (LNK) files.

log - LOG is a file extension associated with Log files. It is a text file.

M2T- High-definition video recording format used by many HD camcorders; commonly referred to as "HDV;" uses MPEG-2 compression to store HD video data on DV or MiniDV tapes; supports resolutions of 720p and 1080i.

M2TS - Blu-ray BDAV Video File. Video file saved in the high-definition Blu-ray BDAV format; used for saving video data on Blu-ray discs; based on the MPEG-2 transport stream and supports 720p and 1080i formats. BDAV stands for "Blu-ray Disc Audio/Visual," while the M2TS extension refers to "MPEG-2 Transport Stream."

m3u - The M3U file type is primarily associated with 'MP3 Playlist File'. Generally known as a "Winamp" Playlist file, this format has been adopted by a wide variety of MP3 players. The default program is Windows Media Player.

m4a - MPEG-4 audio file. The default program is Windows Media Player.

M4V - MPEG-4 file extension used for videos downloaded from the Apple iTunes store; includes TV episodes, full-length movies, and music videos; similar to an .MP4 file, but may be copy-protected using Apple's FairPlay DRM copyright protection.

manifest - A XML file that contains information about accompanying files in the same archive.

mapimail - Mail service.

mhtml - MHTML document file. The default program is Internet Explorer.

mkv - A Matroska Multimedia Container file is a video format similar to the .AVI, .ASF, and .MOV formats. By default Windows 7 does not have support for opening this file type and has no association. DivXPlayer is a good free program to install that does support playing this file extension. This download will set this file extension back to the default unassociated state in Windows 7.

mov - Movie file. The default program is Windows Media Player.

mp3 - MP3 sound format file. The default program is Windows Media Player.

mp4 - MPEG-4 movie file. The default program is Windows Media Player.

mpa - MPEG audio file. The default program is Windows Media Player.

mpe - MPEG movie file. The default program is Windows Media Player.

mpeg - MPEG (Moving Picture Experts Group) video file. The default program is Windows Media Player.

mpg - MPEG video file. The default program is Windows Media Player.

msc - Mirosoft Common Console document files.

msi - Microsoft Windows Installer installation package file.

msp - Microsoft Windows Installer Patch file.

MTS - MadTracker 2 Sample File. High-definition MPEG Transport Stream video format, commonly called "AVCHD" (Advanced Video Codec High Definition); used by Sony, Panasonic, and other HD camcorders; based on the MPEG-2 transport stream and supports 720p and 1080i HD video formats. MTS files can typically be opened and edited using the software included with Sony and Panasonic HD camcorders. The default program in Windows 7 is Windows Media Player.

nfo - System Information File

obj - Object file.

otf - Open Type Font file. The default program is Windows Font Viewer.

Package - Package protocol.

pbk - Dial-Up Phonebook file. The default program is Remote Access Phonebook.

pdf - Portable Document Format (PDF) is a file format created by Adobe Systems. By default, Windows 7 does not support reading this file type. Using this to restore the default PDF association in Windows 7 will remove all associations for the pdf file extension. You will need to install a 3rd party program like Adobe Reader or Foxit Reader to be able to open and read pdf files in Windows 7.

png - Portable Network Graphics (PNG) is a bitmap compression method for image files. PNG supports 16.7 million colors, it is lossless and also supports index color, grayscale, true color, transparency, and is streamable. It is thus the best compression method (better than GIF or JPEG) for use on the web.

ps1 - Microsoft Windows PowerShell command line shell and scripting language file. The default program used to open with is Notepad.

psd - The PSD file format, created by Adobe, contains graphics/photos created by image editing software such as Adobe Photoshop.

reg - Registry file.
NOTE: You may need to set the default program as Registry Editor (C:\Windows\regedit.exe) for reg file extensions, or enable regedit before you will be able to use this REG file.

rtf - Rich Text document files. The default program is WordPad.

scr - Screen Saver files.

Search - Windows Search protocol.

svg - SVG document. The default program is Internet Explorer.

swf - Shockwafe Flash Object.

sys - System file.

tar - Tape Archive file. By default, there is no associated program for this in Windows 7.

theme - A Windows theme file.

themepack - A .themepack file is a Windows Theme Pack file used to share themes with others.

tif - Tagged Image files Format. The default program is Windows Photo Viewer.

tiff - Tagged Image files Format. The default program is Windows Photo Viewer.

tmp - Temp file. By default, this file extension does not have a program associated with it.

TS - Video Transport Stream file used for storing video on a DVD; compresses video data using standard MEPG-2 (.MPEG) video compression. TS files are often saved as multiple files on a DVD, i.e. "moviename1.ts," "moviename2.ts," "moviename3.ts," etc. They can be played back by various software DVD players and video editing tools

ttf - True Type font file. The default program is Windows Font Viewer.

TTS - A .tts file is a text file (an ini file) that corresponds to your book. The ToolBook Translation System (TTS) creates the .tts file for you when you set the book's TTS Identifier through the Setup Sources window.

txt - Text document files. The default program is Notepad.

Type - To remove association with blank file extension.

Unknown - Unknown file types.

url - Internet website shortcut link. The default program is Internet Explorer.

vbs - Visual Basic Script files. The default program is Microsoft Windows Based Script Host (C:\Windows\System32\wscript.exe).

vob - Movie data file from a DVD disc, typically stored in the VIDEO_TS folder; contains the majority of data stored on the disc including video, audio, and subtitles; usually formatted as an MPEG-2 system stream and can be opened by various video playback programs.

wav - Wave audio file. The default program is Windows Media Player.

wma - Windows Media Audio files. The default program is Windows Media Player.

wmv - Windows Media Audio/Video file. The default program is Windows Media Player.

wsf - Windows Script Files. The default program is Microsoft Windows Based Script Host (C:\Windows\System32\wscript.exe).

xml - Excel Macro files. The default program is Internet Explorer.

xps - XML Paper Specification document files. The default program is XPS Viewer (C:\Windows\System32\XPSViewer\XPSViewer.exe).

xsl - A eXtensible Stylesheet Language file that defines the style of text, tables, and other objects within a XML document; similar to a .CSS file used by .HTML documents. The default program is Internet Explorer.

zip - ZIP file extensions is a archival and data compression format used to compress one or more files to reduce the size of the file. The default program is Compressed Folders.

Related Tutorials

---

• How to Associate a File Type or Protocol Default Program in Window 7
• How to Set Default Associations for a Program in Windows 7
• How to Hide or Show Known File Type Extensions in Windows 7
• How to Add "Show/Hide Known File Extensions" to Context Menu in Vista and Windows 7
• How to Change the Default Program a File Type Opens With in Windows 7
• How to Rebuild the Icon Cache in Windows 7
• How to Change the Default Icon of a File Extension in Windows 7
• How to Create a Default Programs Shortcut in Windows 7
• How to Fix Manage "File does not have a program associated with it" Error
• How to Unassociate a File Extension Type in Vista, Windows 7, and Windows 8
• How to Create a "Set Program Access and Computer Defaults" Shortcut
• How to Enable or Disable the "Set Program Access and Computer Defaults" Page
• How to Fix "Open with" Opening with Notepad or Error Message
• How to Restore Default Services in Windows 7

 

[bonderman]

Problem solved

Did a complete restore.

 

[Brink]

Hello Bonderman, and welcome to Seven Forums.

I'm happy to hear that you got it sorted, but sorry it took a complete restore.

 

[Kanten]

I need a few more default files...

Hi,

I've been causually looking for a fix for my video files for the last couple of years. When I stumbled upon this fix I was a little dubious, but gave it a try. It worked. I now have all the video previews that I used to have before I started having trouble.

Now that I've got most of them working, I would like to get the rest, if possible. My video files that play with my VLC Player are the only ones now not displaying a preview thumnail. The file types are:
.divx
.rm
.flv
As far as I can tell those are the only ones I need. (.vob) files are displaying, thanks to you.

Thank you for supplying this much needed fix to the community.

 

[Britton30]

Welcome Kanton to Seven forums.
As far as I have found all files that play only in the VLC player always show the silly VLC traffic cone. The way I got arounf it was to convert them to mp4 files the they will play in Windows Media Player (WMP).
I use Handbrake for conversion.

 

[Kanten]

Thanks.

I have video conversion software I can use if I get the urge. But it is good to know.

And thanks again for helping people out with this. I've seen this question asked by a lot of people who legitimately have a problem (not just people who have their settings wrong), and wish this page with the solution you posted was easier to find.

I appreciate the information.

 

[Britton30]

You're welcome.
I do some conversion but I have the entire Star Trek Voyager series on a USB drive, all .mkv and I'm not bothering with converting 25.6GB.

 

[sienna030]

request reg file

Hi,
I heva the same problem as mentione above.
I opened a sub file (.sup) by accident with adobe acrobat so I have to requests for;
- srt reg file
and
- sup reg file

can you do that for me?

regards,
Juan.

 

[Britton30]

Hi,
I heva the same problem as mentione above.
I opened a sub file (.sup) by accident with adobe acrobat so I have to requests for;
- srt reg file
and
- sup reg file

can you do that for me?

regards,
Juan.

Welcome to Seven Forums Juan.
which problem do you have and what is it you want to do?

 

[Brink]

Hi,
I heva the same problem as mentione above.
I opened a sub file (.sup) by accident with adobe acrobat so I have to requests for;
- srt reg file
and
- sup reg file

can you do that for me?

regards,
Juan.

Hello Juan, and welcome to Seven Forums.

The file types .srt and .sup are not included by default in Windows 7. If you like, the .reg file below will unassociated .srt and .sup files to no longer have a default program assigned to them.

Hope this helps,
Shawn

 

[sienna030]

unassociated .srt and .sup files

Hi Britton30,
thx for replying and the reg file, I added the reg file but nothing happend because I the sup file still has the notepad icon.
Is there something else I have to do like reboot?

Juan.

 

[Brink]

Juan,

Yeah, you'll need to restart the computer after merging the .reg file I posted above to apply it same as in tutorial.

 

[sienna030]

Hi Shawn,

it worked like a charm and I also removed the string in ;

HKEY_CLASSES_ROOT\sup_auto_file\shell\read\command

It appears it still had the string for adobe acrobat reader.

I now have the blanc notepad like icon again, thank you so much!!!!!!!!!!

Juan.

 

[Brink]

You're most welcome Juan.

 

[DonMJK]

Hi -

A friend of mine recently asked me to fix a broken keyboard on her laptop running Win 7 Home Premium. In checking it out, I found that the default programs for many file types were incorrectly set to Notepad. Using the Zip file collection of fixes from Brink's tutorial. I was able to fix most of them. A most sincere Thank You.

However, three Security Certificate extensons, .cer, .crt and .der, which should use Crypto Shell Extensions, remain associated with Notepad. I don't know how significant these are as in the short time I have had the computer I don't believe I have seen any issues related to this. If you can help, it would be most appreciated.

Finally, between your great tutorial and studying the reg files in your zip collection, I have started to gain some insight to the workings of the registry. Thanks again.

Don

 

[Brink]

Hello Don, and welcome to Seven Forums.

The default .cer, .crt, and .der registry entries have been added. Hope they help.

 

[DonMJK]

Shawn -

That did the trick. Thanks for the prompt help and the great tutorials!

Don

 

[Brink]

You're most welcome Don. I'm glad to hear that they helped.

 

[Stalin1]

Hello, I had a problem that all my files and programs opening a ms word document format then I read the instructions and downloaded the extension types and I merged all the 105 extension files on my computer and I restarted the computer it was back to normal, I really appreciate this help but Are these secured extension files that I have merged in my computer, please let us know so that we can take precautions before we go head with our computer? I have some personal files on my computer so is there any hacking personal files from my computer? Why I am asking this because I am new to this forum and I don't have much knowledge, I just saw the instructions, downloaded the extension file types and merged in my computer? I am sorry If I am saying anything wrong. It is just for clarification.

Thanks for all your help.

 

[Brink]

Hello Stalin, and welcome to Seven Forums.

I'm happy to hear that they were able to help you.

First, I would strongly recommend in the future that if you are not sure of the safety of or have questions about a download, you should ask about them or scan them first before installing/merging on your computer so you will be safer.

The downloads in this tutorial are 100% safe to use though. They will only restore the default Windows registry entries for the file extension that the download is for.

Hope this helps,
Shawn

 

[abatebasf]

hello

i need (srt) file extension, it's translation file please, add it to your list reg