I have a new iMac which I am setting up. I used Migration Assistant to transfer my files from my old MacBook. Both Macs are running High Sierra.
I was attempting to open Excel2008 to edit a couple of spreadheets, and got a bizarre error message
Mercer.xlsx is being modified by (my name).
Open as Read-Only, or chose Notify to be alerted when it is available.
I have tried a number of things. I went to my MacBook, made sure the files and Excel were closed, copied to a portable HDD. I tried replacing the files, same result.
I opened one of the files from the HDD, and saved it to the Documents directory, and actually modified the file by adding a new line. When I tried to re-open I got the same error.
I cleared all extended attributes, but this did not seem to help. com.apple.FinderInfo 32 com.apple.lastuseddate#PS 16 com.apple.metadata:_kMDItemUserTags 42
Does anyone have any ideas. These spreadsheets contain more than 10 years worth of data.