Real Software still exists and is still making RealPlayer.
They have to keep the company going to use up the money they got from the absolutely massive Microsoft anti-trust suit.
That suit was enormous and people kinda lose the sense of scale it was. It’s a reason Microsoft isn’t operating the ways that Facebook, Google, or even Apple are nowadays. Because that legal fallout was felt deep into Microsoft’s bones and they won’t ever go near pushing their boundaries like that again.
We should probably teach some other companies that lesson. It apparently works.
Is there a reason you can't use VLC?
The best way to check for corruption would just be by playing it. You can play it in VLC or in RealPlayer.
> Assuming my file is NOT corrupted, any software (not Handbrake as it throws errors) that can convert RM to something more modern / avi?
Again, VLC should be able to convert it. VLC probably used FFMPEG in the back end, so you can also try just using that on its own.
It's somewhat more complicated though
https://stackoverflow.com/questions/18108323/converting-real-media-with-ffmpeg