I got a strange error with Excel 2007.  I copy an existing XLSX file that I can open without any problems.  I rename the file and opens the copy of it.  Now I got following error

If I click "Yes" the file ops and I got following message

The log just mentioneing nothing special as the same error message.  When I want to save this file, the popup for a new filename is coming up.  I can overwrite the original copy without any problem.  Afterwards the file also opens without any problem. For the rest everything in the file is working.  When I copy this file again, the same problem comes up.  It seems that copying the file will make the file corrupt.

By searching the net I found several solutions which doesn't apply this problem.  There are no Pivot tables or links to external files in.  Only listvalues on another sheet in the same workbook.

If I copy the file to another disk, there's no problem.  It seems more a problem on the network disk I use. I already found something with the date time stamp of the file. Don't know for the moment what's wrong with it.  Have to look for it.