Disable changes to the File Associations

Many programs and users will change file assoaciations as they like and you will have a hard time to restore your ever loved settings. This is how to disable change in file association.
Start>Run
Type regedit
This opens the registry editor. Now navigate to the key
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer
Create a dword entry named "NoFileAssociate" and put its value to 00000001. Modify the value if it is already there.