Comment 7 for bug 197295

>> 1.) If I select the extension file type and select a file in the "Open" file dialog

>Sounds like Bug #199357

Yes, sounds like the same.

>> 2.) If Inkscape auto-detected the file type self and select the only the file

>Sounds like Bug #187290 (but then maybe for java instead of python?)

Sounds like the same here, I have tried the patch but same result. The problem is that a shell window for the executable is never visible. The extension can be build as
java version, .NET or static linked gcj compiled binary and no version works. The PATH is setup in Windows (XP SP2) and all versions could be used in a Windows shell.
So I'm not sure if its the same, but it looks like a environment problem too.
Has someone an extension working which runs in a shell window with Inkscape 0.46?