Hi Jean-Yves,
I'm really sorry to hear that you're having issues. I've replied separately by private message but for the benefit of others following this thread I can confirm that this version definitely works on OS/2 Warp 3 with FixPak 40.
I know this because I installed it myself and successfully built, ran, and then compiled a project on genuine OS/2 Warp 3 with FixPak XR_W040 on my IBM PC 300GL. The compiled EXE file then ran successfully on a *different* OS/2 Warp 3 FP40 PC (one of my legacy ThinkPads).
I fear therefore that it's an incompatibility with ArcaOS 5.x and I hope others in the forum are able to offer some useful suggestions.
I will be delighted on your behalf if I'm proven wrong about it being a compatibility issue rather than a disk corruption issue!
Best,
Richard.