Question: there is htmex.bat but I don't see htmex anywhere in the mk4ht.pl. I don't either. Can it be mapped to: mk4ht ht mex ... Looking at the scripts on Unix, it seems likely. I don't know. Try it ... What is this mex anyway? A format invented by the Polish guys long long ago. There is a "mex" executable + support files in TL.