Resident Evil Revelations use WMP to play its Cutscene, and since that is not part of Proton, you have to install them manually.

First, you need to start the game in proton 5.0. Don't play. Just start it, so it creates the prefix folder in steam.

Then put this into the terminal

Resident Evil Revelations use WMP to play its Cutscene, and since that is not part of Wine, you have to install them manually.

Open Terminal and then put this into the terminal
WINEPREFIX is where your wine folder is, so you need to change til link to the wine folder you have the game in.

It will Download WMP9, and when it's done, the game should now show the cutscenes.