Windows 7 Forums

Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.

Windows 7: What is this 3GB file? MSSDMC?

29 Jan 2010   #1

Windows 7 Ultimate 32 and 64 bit
What is this 3GB file? MSSDMC?

There's this huge 3GB file in C:\Users\myusername\AppData\Local\Temp\MSSDMC
that has a long encoded name that I can't figure out what it is.

I f'ing Googled MSSDMC and there were 0 results. Zero. WTF?

Anyone got any info on this? I'm deleting it and seeing if it comes back.

Attached Thumbnails
My System SpecsSystem Spec

29 Jan 2010   #2

Windows 7 Professional x64


I wonder if that is a virus. It is suspiciously close to the file MSSDMN.

While that is not necessarily correct, running a virus scan is never a bad idea.

I recommend Malwarebytes if you suspect your computer is infected.
My System SpecsSystem Spec
29 Jan 2010   #3

Vista Ult64, Win7600

Delete it, it is in the Temp folder.
My System SpecsSystem Spec

29 Jan 2010   #4

Windows 7 Ultimate 32 and 64 bit

@Johnathan_King - I don't suspect a virus, my system has had AV scans daily since it's inception. Also confirmed by scanning the files directly.

@jfar - probably what I'll do.

Interestingly I did a google search on the file name (hash) and it came back as a SHA256 for the ISO of Windows 7 on some French blog. Crazy! 63C02E9F0B91061203CA67D71456EA0F8A8C5C90134439C707DE32090251391E - Google Search=

I'm thinking it's like a temporary file for Windows setup? I was just curious if anyone else had this file in their temp directory.
My System SpecsSystem Spec
30 Jan 2010   #5

Windows Seven Ultimate

After you deleted it manually, run disk cleanup (type in start menu search) to remove any other temp files.
My System SpecsSystem Spec

 What is this 3GB file? MSSDMC?

Thread Tools

Similar help and support threads
Thread Forum
File Open or Choose File dialog hangs application after selection made
Hi. Windows 7 Pro SP1 64 bit Intel i5 CPU @2.67 GHz 8 GB RAM This problem just started recently or I only noticed it in the past week or so. When I'm in any application that launches the File Open dialog, including any browser's "Select File/Browse" button to choose a local file, when I...
General Discussion
when open a word file or pwrpnt file another file is opens
God bless you, I am not a computer person please help me to fix the problem I have. Every time I open a word, power point and note pad program another file is opens with that (with a infinity sign in the front with the same extension ) is that a thread or how can I stop this thank you...
Microsoft Office
CBS.log file: Getting a usable txt file and interpreting the file
First, what does "CBS" mean in cbs.log? Does the cbs.log file show only errors? I create a cbs.log file a lot, so if there are errors, I'd like to correct them. However, my computer seems to be working just fine. sfc /scannow shows everything is OK. I've tried findstr /c:""...
Performance & Maintenance
hidden file of docx file created with ~$name of file.docx file
whenever I open docx file there is hidden file ~$name of file.docx created. which type of file is that? Is it in virus, maleware. for example If I open house.docx file then ~$house.docx file created which is hidden form. I had saw this file when i select show all hidden file option. when i try to...
Microsoft Office
Batch File that grabs file names from folder to insert into batch file
Ok I'm totally at a loss on how to word this so I'm just going to write it out the best that I can... :confused: First I have a batch file that I'm writing that will convert mp4 files to mp3 files (I have a lot) for a buddies band using ffmpeg. Here's the code that I'm using: ffmpeg -i...
General Discussion
How do I change a file's file type (not only file association)?
I need to change a zip file to an epub file. I have heard this can be done, but when I add the .epub after the file name, I notice the file is still actually zip type file when I right click properties. This is causing a problem when I try to open it in in different ebook reader programs. I...
General Discussion

Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd

All times are GMT -5. The time now is 20:29.

Twitter Facebook Google+

Windows 7 Forums

Seven Forums Android App Seven Forums IOS App