Start Regedit.exe and navigate to:
Backup the branch by exporting to a REG file
Look for the sub-key named "UserChoice", and if it's present, right-click on the "UserChoice" branch and delete it.
The "Open with" association is now undone.
Reboot to see if the icons for DLL files are reset.
Ramesh Srinivasan, Microsoft MVP [Windows Shell/User]
Windows® Troubleshooting http://www.winhelponline.com
"T5" <email@example.com> wrote in message news:us6oHyuTHHA.4028@TK2MSFTNGP04.phx.gbl...
I inadvertantly set a dll file to open with system mechanic and now all of
my dll files have a red cross through them, how do I change them back to dll
BTW I dont have a ShellIconCache listed in system 32