“The file is corrupt and cannot be opened” Excel 2010

It is not common issue but the solution is quite easy:

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

Remamber to check all options under Protected View after you finish playing with that file.