Hi, I'm Pete. Welcome to JustAnswer! I'm reviewing your question now, and will post back with your reply ASAP.
What is the error you are getting when you try to open Excel files?
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Could you try opening one of the files on a different Mac to see if it works there?
Or attach a file here using the Add File button so that I can try opening it here?
Ok, so the files are ok but your Mac is not able to open them..
It may be trying to use the wrong application or the wrong version of Excel.
On the Mac, select one of the Excel files in Finder, then Right click on the file and choose “Get Info.”
Change the application in the “Open with:” drop down box to Excel 2016.
Let me know if it opens ok?
A .doc file is not an Excel file, that is why it is not valid.
You will need to try opening the .doc file with Word.
Let me know if it opens ok with Word for Mac?