The forum

There is a typo in the script that PlayOnLinux provides for Borderlands. Someone corrected that and posted a revision to the script in this thread:

http://www.playonmac.com/en/topic-4313-Updated_Bordlerlands_script.html

This problem has existed for at least 2 months. Hope the heads up is useful.

This error was corrected but uploaded for some unknown reasons...thx for pointing this, it's now solved.

Great, thanks!