Hi, I just build `wine` with ./configure --enable-win64 make depend make following https://www.winehq.org/docs/wineusr-guide/installing-wine-source out-of-tree and find `wine` and `wine64` in the source root assuming they are the 32- and 64-bit binaries. I don't understand why env WINEARCH=win32 WINEPREFIX=/home/richter/.PlayOnLinux/wineprefix/UnrealT2004ECE_gog ./wine programs/wineboot causes wine: '/home/richter/.PlayOnLinux/wineprefix/UnrealT2004ECE_gog' is a 32-bit installation, it cannot support 64-bit applications. if `wine` is the 32-bit binary. experienced with wine-1.9.22-72-gf7187ec on Ubuntu 16.10 -Kalle