When I try to import it loads but it says Unknown property: "mesh" in undefined .When I try to export it says, Unable to convert: undefined to type: Integer
3dsmax 6,7 and especialy 8 are useless for warcraft so sorry... You can try all you want but nothing will change unless you can get a knife to the throat of the guy who made the importer/exporter for warcraft3. But you don't want to do that... Did I get a little offtopic?
there are no proper importers for any version of max... you will lose animations every time. Max 6,7 and 8 can use dex script to export your work. You will experience some missing data and errors. You will need to know mdl editing to patch up whats missing, its not perfect. If your looking to edit existing models then max isnt the route to go.