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Preventing Changes to File Associations
Submitted 9/18/02

You can prevent users from changing associations via Windows Explorer's
Tools / Folder Options / File Types tab.

Start Regedit
Go to HKEY_CURRENT_USER \ Software \ Microsoft \ Windows \ CurrentVersion
\ Policies \ Explore
Create REG_DWORD data type NoFileAssociate
Give it a value of 1



Locking File Associations
Submitted 9/18.02

If you have your file associations the way you want for a particular file
type, you can remove it from the list that gets displayed in the Folder
Options / File Types screen

Start Regedit
Go to HKEY_CLASSES_ROOT
Scroll to the file association you want to lock.
In the right panel, create a new Binary value
Call it EditFlags
Give it a value of 01 00 00 00
Now when you go to the Folder Options / File Types screen, you won't see
that file type listed.