Блин, отвяжи уже всё от внешних ДЛЛ. Пускай игра использует только свои.
The DLLs are always there, in some compilations they are standalone, in some compilations they are included directly into the EXE.
The build system, where DLLs were included inside the EXE doesn't support Windows XP (or Windows Vista) anymore, so I can't give it to you.
If you want you can still install some old Linux (with proper SDL1 support) and some old version of the MXE build system (from year 2020 or older) and compile OXCE for WinXP yourself.
Guidelines are here:
https://openxcom.org/forum/index.php?topic=7048.msg111478#msg111478But I simply don't have this old hardware and the old tools anymore.
(the old build farm by Stoddard which we used before doesn't exist anymore)
I (and SupSuper) will keep trying to create a working github build for WinXP for a bit longer...
...but if it doesn't work, I will simply say WinXP/Vista are officially not supported anymore.