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Take a look in:
HKEY_CURRENT_USER\Software\Microsoft \Windows\C urrentVers ion\Explor er\FileExt s\
and the sub-key of that is the extension you reassigned. Under that there will be the UserChoice and OpenWithList sub-keys which will contain your redefinition.
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Try this--
http://social.technet.microsoft.com/Forums/office/en-US/ef072ed2-0349-4caa-8c69-837d8a022aa3/how-to-change-windows-7-file-associations-in-the-registry
changing as required for .tif and MS Document Imaging
Or
go to HKEY_LOCAL_MACHINE\SOFTWAR
If you are confused by now, try this
http://stackoverflow.com/questions/9093481/add-a-new-file-association-in-windows-7
http://www.ehow.com/how_6872470_change-file-association-regedit.html
I am showing my ignorance, but I think I would first try the manual method (see http:#a39290504 ) on one PC, see what the entries in the Registry look like, and then you can disperse that setting to the other users.