I had this issue with game v1.0.2.7795, on Xubuntu 20.04 64 bits, bottle: win7 64-bit, Crossover 20.0.0 Linux.
After installation, when double clicking 'Wing Commander Saga' icon, nothing does happen while the game should load. Workaround: create a shortcut to 'wcsaga_sse2.exe' instead of 'Wing Commander Saga.exe'.