unable to save project

Hi all,

Running Tweak (Tweak3.8-6665.image, all updates loaded) on a
linux-machine, I'm having trouble trying to save porjects. Whenever I try
to use the 'Save Project'-dialog from the file-menu of the
CProjectBuilder, this raises an error

MessageNotUnderstood: UnixFileDirectory>>mimeTypesFor:

Any help appreciated

Markus
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