From the command line assoc .tif
then using ftype
(example)
----------------------------------------
Microsoft Windows [Version 6.0.6001]
Copyright (c) 2006 Microsoft Corporation. All rights reserved.
C:\Users\administrator>assoc .tif
..tif=TIFImage.Document
C:\Users\administrator>ftype TIFImage.Document
TIFImage.Document=%SystemRoot%\System32\rundll32.e xe "%ProgramFiles%\Windows
Photo Gallery\PhotoViewer.dll", ImageView_Fullscreen %1
C:\Users\administrator>
----------------------------------------
may reveal something.
Also check for the DWord 'NoFileAssociate' in registry.
http://support.microsoft.com/kb/257592
--
Regards,
Dave Patrick ....Please no email replies - reply in newsgroup.
Microsoft Certified Professional
Microsoft MVP [Windows]
http://www.microsoft.com/protect