I am also experiencing a problem opening older excel files with Excel 2013.
I have installed Office 2013 64bit on Windows 7 Pro 64bit.
Every file from older versions that I open with either Word or Excel gives me an error message "The file is corrupt and cannot be opened".
It is NOT a problem with default program association. It is also NOT a problem with the file itself.
The file opens up perfectly with Office 2010 I have on another computer.
With Word 2013 I found a way to open files by Right Click and use Edit option instead of Open.
This opens up the files and I can save them in 2013 format.
Excel does not provide Edit option, hence every time i try to open the file it fails.
If anyone has any ideas, i will appreciate if you shared them with me.
Thanks.
It is NOT a problem with default program association. It is also NOT a problem with the file itself.
The file opens up perfectly with Office 2010 I have on another computer.
Of course not. It is a Windows program or, in other words a manufacturer poduced virus. Same as with most of MS ****.