UPX4TC How to use pak correctly?

[TotalCommandeur]

UPX4TC How to use pak correctly?
Link to download: http://web.cefriel.it/~frumento/uploads/Programs/UPX4TC.zip
Thanks to Enrico Frumento for development!

I found an UPX tool working with MultiArc at the Plugin development & support forum.
Link: http://www.ghisler.ch/board/viewtopic.php?t=188&highlight=upx4tc
The configuration instructions given and the .addon-file is made in 03/2003, I really do not understand how to istall the Plugin under TC 6.03.

I posted this question in the German forum, without getting answers, but I think there are more english speaking users, maybe I have luck!

The steps of my non-working configuration:

1) Copied content of UPX 124.addon (file-version 1.1) to my multiarc.ini (MultiArc version 1.1.2)
2) Added in multiarc.ini the correct Path for the archiver.
3) Edited wincmd.ini: UPX=223,PATH
4) Made buttons using lst3str and the given instructions

Get following error:
lst3str ERROR You haven't specified either /X: or /L: parameters, please add them and try again.
-> But I used already the parameters as I configured the buttons!?

Also I think my positions 3) and 4) aren't correct.

Please help me.

Thanks

Besides, is there any information out how to use variables (for the archivers' path) in multiarc.ini? The last info I have is that it is not possible...