Just trace why your file is not found by setting c:\>set KPATHSEA_DEBUG=-1 c:\>set KPATHSEA_DEBUG_OUTPUT=err.log c:\>latex oh.tex But let me say : - fpTeX will not handle cygwin mount points at all - fpTeX adds a bit more than the raw teTeX distribution, things like automatic location of ghostscript, path handling, native win32 system calls in some crucial places etc. Greetings, -- Fabrice Popineau