You can extract the archive with Unrar; however, tumac isn't able to convert the .bat files to Mac (since it uses biffing, which tumac doesn't handle). Manual translation shouldn't be too difficult, if you can do that.
EDIT: I'd like to grab the occasion to point out that, since you're using a version of WeiDU that has the MAKE_BIFF command, you should use that to biff the movie, rather than using AT_* *.bat. In the tp2, simply use
CODE
MAKE_BIFF ~va#movie~ BEGIN ~TOD/Mve~ ~^.*\.mve$~ END
rather than the two AT_* calls. It'll handle backups and everything automagically.
If you want to use .bat files for biffing the movie, they should be both AT_NOW and AT_UNINSTALL (otherwise, the biffing is called multiple times when reinstalling non-interactively, possibly causing bugs). Also, in the uninstalling .bat it's better to restore the backup you created while installing (copy TOD\Backup\chitin.key .), rather than using --remove-biff.