I recently upgraded my office to 2010 from 2007 after that i am unable to open any .xls files created by previous version
no issue with the files because i can open it in 2003 sp3 and 2007 sp2 versions
Try the following steps:
1. Open Excel 2010.
2. Click on File > Options.
3. Select Trust Center > Trust center settings.
4. Select Protected view.
5. Uncheck all the options under Protected View > OK.
6. Restart Excel 2010 and try to open Excel documents.
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