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In the explorer: [filesystems & project tab] If a file is of an unknown extension, like ".h", then you can right-click and "Convert to Text". This allows you to edit the file in the NetBeans editor. However, it removes the ".h" from the name in the explorer. If you have two files, such as "foo.h" and "foo.c", and you do this to both, they are now indistinguishable.
This has nothing to do with projects module. It probably belongs to text. If not please reassing accordingly. Sounds like pretty annoying -- changing to P3.
Reassign also to the new owner ...
As designed. You can force IDE to show extensions of objects. Go to Tools | Options | System Settings | and Show File Extensions set to true. Than (after restart) you'll see extensions for all objects. Maybe for text objects should be default to show extensions since there could be many of them. But for the moment I think that the above should be enough to solve this kind of problem, so I marked the bug as WANT FIX. If you feel that's a wrong opinion please open a thread in [nbusers] or [nbui] and we could find some solution.
Resolved for 3.3.x or earlier, no new info since then -> closing.