This definitely sounds like an issue that should be worked on from the other end, but you gotta do what you gotta do.
I’m guessing you’re using Edge og the new computer? What browser did you use on the old one? This setup sounds legacy enough that you may want to try opening the file in IE mode.
Edge can also do right click > smart copy, I’m not 100% sure what that entails, but it’s also worth a shot.