I am wondering if this my2 problem has something to do with Maverick update but

Question

I am wondering if this my2 problem has something to do with Maverick update but my Mac Excel no longer works. I can save a file and it wwill open once but after that it will open but be completely blank. As for older files, ones that I desperately need, I keeep getting this message: The file format or extension is invalid. Verify that the file has not been corrupted and that the file extension matches the format of the file"

I have spent hours on these forums and Mac forums reading about other peopel havign the issue and trying to troubleshoot it myself. I have already attempted opening the file by putting it in the shared folder and creating a new user. I have also cached the fonts, eliminated all fonts with warnings and duplicate fonts. I have gone into disk utility and repaired permissions. I have also tried software like Onyx to repair.I have also trashed Word font cache. Nothing has worked. Could someone please help me figure this out. I do have the files on an external hardrive and have tried uploading to a PC or Google Drive Spreadsheet and nothing has worked.

Does anyone have any suggestions or why this is happening. I no longer have the disk so I can't reload. I was wondering if my best bet now moving forward would be to revert back to an older operating system.

Any insight would be helpful.

Thanks,! :-))

Explanation / Answer

I've been having a minor issue with Excel and Maverricks myself

I've found that there is an additional com.microsoft.Excel.plist file.

If you find and remove the second one. And restart computer Excel will open normaally. However a new one will generated. I haven't found what's causing it. yet. I've repaireed permissions removed all duplicate, fonts. I've even reset ACL's In the Recovery Disk. Rright now I am trying, locking this additional Preferences file So far it lets Excel open correctl!y.

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