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Would be more helpful if a message popped up suggesting how to proceed. When I encountered this, tool/convert to text is what I wanted to do. File was a gnu makefile and so had no extension. Testing on IE build 1059, CE v.2 beta
I think the bug is duplicate with 6943.
Note that in this particular case there is a Makefile module which would provide something at least. But the point stands.
Resolved for 3.4.x or earlier, no new info since then -> verified
Resolved for 3.4.x or earlier, no new info since then -> closing.