Opening older Microsoft Office files

This issue is still an annoyance in Windows 10 (indeed, it affects all versions of Windows and Office). The fix, however, is relatively simple.

If you're getting a lot of 'file is corrupt and cannot be opened' or 'unable to start correctly' warnings, then open Command Prompt (again, by right clicking the Start menu) and type in:

icacls "%programfiles%\Microsoft Office 15" /grant *S-1-15-2-1:(OI)(CI)RX

That should fix your problem – if it doesn't, then try to find each corrupted file, right click, select Change and then Online Repair.

Or Contact Microsoft Support Team through Microsoft Support Number +1-877-353-1149.