For it to work on Windows with ActivePerl you need to get version 0.0.8 of Mobiperl.
I tested html2mobi on Windows with an HTML file and it worked. There was some problem with an opf file but I will look at that. I will also fix so that lit2mobi works properly on Windows.
It should be possible to package a Perl program in one Windows binary using PAR::Packer but I could not get it to work in Windows with ActivePerl (it did work in Linux). If I get this to work I will distribute the programs that way also. But the solution to the problem might be to wait for a better binary distribution of PAR::Packer and then it can take some time...