Got it to work!! Thought I would leave some notes in case this can help somebody else.
The key seemed to be that their QB file was showing as Version 2005 and I was trying to use Version 2022 to open it.
It wasn't until I used the File Manager to check the version that I realized it showed up as Version 2005. I just assumed they had a more recent version of QB for Mac. Or maybe the data traveled back in time when they did the Backup to Windows on their Mac.
I no longer have Version 2005 on my workstation, but I still had Version 2013. And in that copy of the program, the Forgot Password - Password Reset tool worked.
Interestingly, when I reset the password to something like 2358Cpa$, that password did not work. But 2358cpa$ did .(Note the lowercase c). This wasn't me and my fat fingers. They had two data files, and this was true in both sets. I paid attention on the 2nd run of this and made sure I typed in an upper case C at the reset (the reset requires upper and lower case), but then when I later logged in to update to Version 2013, the password would only accept the lowercase c.