Afaik this game never had a 64 bit executable publicly available. Only merely 32 bit one, which leads to memory allocation issues and other issues in many cases.
Since there didn't seem to be a wish for it I just created it.
Normally getting code rebase for such an old game would be a clear case of "JUST NO" but since GOG has ties with CDPR and both are growing then odds here are non 0.
IT world is currently in transition period and 32 bit support is being dropped from more and more software. Sooner or later it will be deemed legacy.
It would be great if CDPR would step up and rebase the game into 64.
Here:
https://www.gog.com/wishlist/games/the_witcher_1_64_bit_executable
If any of you guys and girls are interested then go ahead and vote. Each vote matters. The more you make the bigger the possibility of CDPR actually making it happen.