can't open password protected files
I have made a clean install of Catalina due to a slowdown in performance on a late 2012 iMac.
All went well and the Mac is now as good as ever.
I can't open password protected files on the iMac for some reason, with a notification that file is not recognised the correct type.
The protected files are 5 years old and have opened correctly in all that time.
I don't know what version of pages created them but it was running High Sierra at that time.
Non protected files open without issue.
We are not entering the wrong password as the file opens on our MacBook Pro running Monterey.
Any advice to sort the problem?