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Old August 29th 14, 09:46 PM posted to microsoft.public.excel.setup
[email protected] hintz72@gmail.com is offline
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First recorded activity by ExcelBanter: Aug 2014
Posts: 1
Default Microsoft Excel Viewer cannot open files of this type (xlsx)

regedit
HKEY Current USERS
Software
Classes
..xlsx
right click on default and hit
then reassociate file with viewer