We currently use the (fairly clunky) nsis route to create single file
executables with py2exe as input, but with the new bundle_files option it should
be possible to integrate our tcl/tk stuff into a common library.zip as that
seems to be the method used by freewrap.
After investigation it seems as though this ought to be doable with Tcl's vfs
command, but that isn't available in Python 2.4's Tcl as it's only up to version