How to deal with the "unexpected error when detecting file type" message?

How to deal with the "unexpected error when detecting file type" message?
A good starting point is to provide the information that would help someone answer your question... otherwise it might get ignored:
- what version of Trados Studio are you using?
- what type of file are you trying to open?
- have you got any file specific custom settings?
- can you provide a sample file that also generates this message?
Paul Filkin | RWS Group
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