Rhythym: I checked the GOG support to see if I needed a specific .dll file that was missing from the download and when I took a look (General Problems Windows Version -> Crash when an FMV intro or cutscene suhould be played), it says under additional info to "Uninstall your codec pack, reinstall the game, install a different codec pack" as the first piece of info. It has under it a link to something called the Combined Community Codec Pack.
As much as I want to play this game, I don't think having to download something additional from another source as the game support is suggesting is that good of an idea.
I got installed the CCCC and it's harmless. A great help to play lots of video files you find online :p comes also with the Media Player Classic SW.
I had that before purchasing Caladrius so never saw this error msg..