I forget to say that libldap (i386) must be installed (why? ), unless that, the mod will not launch and wine will complain:
This is not a wine requirement neither a PlayOnLinux requirement, wine can run without that, but some Steam apps can’t. You can install “libldap-2.4-2:i386” on Debian.
err:module:load_builtin_dll failed to load .so lib for builtin L"WLDAP32.dll": libldap_r-2.4.so.2: cannot open shared object file: No such file or directory err:module:import_dll Loading library WLDAP32.dll (which is needed by L"C:\\program files\\steam\\steamapps\\sourcemods\\gesource\\bin\\client.dll") failed (error c000007a).