considering you've referenced it at least three(?) times in this thread, I'd like to know the whole story of "Red Dead got deleted." tbh, it sounds pretty nuts to an outsider like me, so i'd love to be informed about the whole fiasco.
I spent all of 5 minutes (since I'm watching Game of Thrones) looking for a source, and I gave up. Most of it has been buried with all the "A PC Port Will Eventually Arrive!" stuff that Kotaku and the like try to spread.
There's two sides to the rumour of the RDR port:
A) The one I'm more trusting of which I read a long time ago in multiple sources was that the Rockstar department handling the PC port of RDR suffered either a flood or power loss or something, and at the time they were not keeping adequate backups. They lost a significant amount of files, if not all of them, and so Rockstar decided to cut their loses and cancel the port.
B) One other rumour I've heard (which does make more sense, but I only heard it from people I don't trust) is that when Rockstar first started porting, they found the source code to be "too much of a mess", and so they ultimately had to give up. I'm guessing originally Rockstar tied a lot of stuff to console-specific functions, and also made a lot of redundant calls and weird functions which made the code very complex. Who knows.