It outputs simply "failed to load avisynth.dll". I've also tried on a fresh installed FreeBSD 8.2 i386 with compiled wine from ports. Still the same problem "failed to load avisynth.dll". I reinstall to a Gentoo Linux and run avs2yuv.exe from wine, it just works. Still cannot find out what the problem to prevent avisynth.dll being loaded under FreeBSD wine. Reproduce Steps: 1. install wine from BSD ports 2. download avisynth installer from http://sourceforge.net/projects/avisynth2/files/AviSynth_Alpha_Releases/ 3. install avisynth.dll Code: > wine AviSynth_Installer.exe 4. download avs2yuv.exe from http://akuvian.org/src/avisynth/avs2yuv/avs2yuv.exe 5. make an empty avs file. e.g. Code: > touch hi.avs 6. execute it to get the error. Code: > wine avs2yuv.exe hi.avs -o hi.y4m the above steps works on Gentoo Linux, fails on FreeBSD 8.2.