How can I transfer save games from Rogue trader over to the steam version?

You'd be better off contacting Forza Support directly.....not convinced anybody form Playground Games (Horizon developers) goes anywhere near Twitter...even the Forza Support page rarely posts any updates about issues.

I think the issue is related to how games on Steam save games etc and that it's not straightforward to transfer over...after all, you can't even transfer your save from a Microsoft Store version to a Steam version on the same PC. I think if they were able to do it or it was simple to do, they would have enabled it when the Steam version first released.

Given where we are in the game's life cycle with FH5 less than 5 months away, I wouldn't expect anything to happen now even if they could do it

Saves don't transfer to the Steam version of the game. You'd have to buy it from Microsoft to keep your progress.

a good few games saves can be transferred from gamepass to steam easily, some require a third party app to convert the saves, but yes can be done, i transferred a bunch a while ago as my main platform is steam, i also transferred saves between GOG, EA, Ubisoft and Battlenet. Epic hardly needed anything done as a lot of the games on epic are actually steam games (lol).

Some saves can also be transferred to gamepass games quite easily.

Hello dear Gamer, first it's a pleasure to be able to help you today.

My name is Vinicius.

I am a gamer and independent advisor on the XBOX community platform.

Hey BostonRoberts, how are you today? Hope you're well.

BostonRoberts, unfortunately, for fallout 4 you can't transfer save files from the Xbox version to the Steam version. :/

One of the only games that can be done is Destiny, but, with destiny, it is done via the Games account from the company, which allows that procedure. For the majority of the games, there's no way we can transfer even though both are PC versions, they're two different platforms (Xbox GP and Steam)

They're setup as separate platforms. If you were to just play from the Windows store version from Game Pass, you could use the same save for both the console and PC since it's a Play Anywhere title and supports that, but the progress from Steam cannot be transferred over.