не е проверено, но изглежда обещаващо.
имам такава ситуация и ще проверя как се държи /regserver, след това ще допълня този пост
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Command-Line Switches
The lovely Beth Melton, Microsoft MVP for Microsoft Word, made me realize I need to include these instructions here because...well, because I saw her post it enough! :)
Beth says the /regserver switch will re-register the application, which will recreate all of the application-specific Registry entries and it also recreates the file associations. Since the "Open with" command uses the file associations you'll still encounter errors if the file associations are damaged or corrupt.
Hit Start-->Run and type the command-line switch below into the box and hit Enter (or click OK). Note that there is a space before the slash:
For Word, type: winword /r
For Excel, type: excel /regserver
For PowerPoint, type: powerpnt /regserver
For Access, type: msaccess /regserver
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