I've investigated a little and it seems and xdg-open bug. E17 does make an effort to be as freedesktop.org compliant as possible if I'm not mistaken. Rumor states it's fixed in Karmic, so we'll wait 15 days. In the meantime, could you still point me to the file with the code? I can change it to open with thunar.
Edit: found it! With the help of aptsh listfiles I found the file /usr/share/pyshared/twl/main.py, changed xdg-open in line 502 to thunar and it works.
Also I noticed the icon is invisible on a dark panel. Nothing serious, but a white border around the W would suffice.
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