Sorry about the html, James. Instructions: http://wiki.winehq.org/Wine64 Thanks. I followed instructions. It seems to be OK to use two git repositories and compile one and then the other, provided you compile 64 first. And I installed both of them. wine64$ ./configure --enable-win64 && make sudo make install wine32$ ./configure --with-wine64=../wine64 sudo make install Then I tried using a single git repository. In both instances, I started installing my program (Dragon NaturallySpeaking) and it did well until it got to installing the C++ runtime, then stopped with an error. fixme:heap:HeapSetInformation 0x2c4000 0 0x23fce0 4 err:seh:setup_exception stack overflow 96 bytes in thread 0015 eip 00007f3fedcaf1b7 esp 00000000001415a0 stack 0x140000-0x141000-0x240000 fixme:ole:NdrClearOutParameters (0xa8dec0,0x7e86be8a,0xa8e208): stub fixme:ole:NdrClearOutParameters (0xa8dec0,0x7e86be8a,0xa8e208): stub fixme:ole:NdrClearOutParameters (0xa8d140,0x7e86be8a,0xa8d488): stub fixme:ole:NdrClearOutParameters (0xa8d140,0x7e86be8a,0xa8d488): stub fixme:ole:NdrClearOutParameters (0xa8d140,0x7e86be8a,0xa8d488): stub fixme:ole:NdrClearOutParameters (0xa8d140,0x7e86be8a,0xa8d488): stub fixme:ole:NdrClearOutParameters (0xa8d140,0x7e86be8a,0xa8d488): stub fixme:ole:NdrClearOutParameters (0xa8cf30,0x7e86be8a,0xa8d278): stub err:ole:ifproxy_release_public_refs IRemUnknown_RemRelease failed with error 0x800706be err:ole:ifproxy_release_public_refs IRemUnknown_RemRelease failed with error 0x800706be Any ideas, or is this a bug. if it is a bug, should i file?