ZZYZX

Theoretically fixed that in the latest Git commit. But if not, just try to kill UDB and re-add the archive. It should not happen a lot of times in a row. It's also not a critical action (and not a long one); it should at most run for 10 seconds, that's why the window is disabled for the time.

Win XP is the topmost version of Windows it can run on. The reason is that RADCAD is a Win16 application (i.e. 16-bit GUI app) and 16-bit subsystem was removed after XP You can however easily run RADCAD in DOSBox running Win3.1, that's what I did to avoid setting up an entire VM like VirtualBox :) It's painful to use it like that though. Also: are mission briefings planned?