When Excel couldn't save a file, 3E0CF950.MACTF was created, but where and by which program?

HelloLChoiSF ,

I, unfortunately, also just faced this same issue. I was working on an excel file and went to see but was told there was and "error saving and a temporary file 'EA8DAA70.MACTF' was made. Rename it and open with excel" couldn't find it anywhere. I went to terminal and wrote: "open $TMPDIR" this was sending me to the temporary files but still found nothing. I saw a post from the Microsoft team saying they don't know about .MACTF and to contact Apple support. Apple support just went through the same things I did and nothing was found.

If you had any luck, or if anyone else knows what to do let me know.

Thanks,

@AGervasi