How do you change the (steering wheel) animations in RACE 07?

[PiMoNFeeD]

I've seen a couple of mods with custom wheel shapes for RACE 07 (and for GTR2 since they have the same file format for anims) and the hands are working pretty nice so it means that the mod has custom hands animations for steering wheel, my question is how do you change them? I googled the file format of the animations and found what it is and the program for it, but it keeps telling me that it's a wrong file format and it can't be opened