ok, i figured it out on my own. the only difference between moxmap version 4 and 5 is that 5 adds a delay value after the clone entry. in my case simply doing a replace all of 'N,0' with 'N' converted it to the older format.

the reason for doing this is that midiox v7 is simply incompatible with win98se. it seems to work with some stuff, but crashes the system hard with some combinations. midiox v6 works solid and i think v6.5.1 was the last release (and it supports .tmx v4). the author actually hosts all the previous versions on his website, but doesn't provide links. if you look at the version history and alter the filename in the url you can get it.