Hide *SOME* file extensions?

Code:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\RDP.File]
"NeverShowExt"=""

Edit: For others that might find this thread.
1) Show file extensions per this tutorial:
File Extensions - Hide or Show

2) Create a new text file on your desktop...
...right click on an empty spot on your desktop
...select New from the context menu
...select Text Document from the context sub-menu

3) open this newly create text file

4) highlight/copy all of the info in the code box above

5) paste all of that info into the open text file

6) save this text file

7) close/exit the text editor (notepad?)

8) rename the newly saved text file...
...right click on the file
...select rename from the context menu
...delete the entire name - including the file extension
...type in a new name hide-rdp-ext.reg
...click on Yes to the warning about renaming file extensions

9) merge the reg file...
...double click on the file
...click on Yes to the warning from the User Account Control
...click on Yes to the warning from the Registry Editor
...click on OK to the message from the Registry Editor

10) log off

11) log on

Files with the RDP file extension should now be hidden from most views.

Be careful what you wish for. Renaming a text file (or most any file) with the rdp extension will also hide that extension. For real RDF files, my limited testing shows that hiding the file extension has no impact on how the file works/interacts with the operating system.