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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.
Reassigning to the owner of the convert to text action. Please try version 3.2 and check whether the wrong behaviour still persists. Also note that now there is an option to show/hide file extensions.
I mark this as WONTFIX. It's designed the way. (Not sure, but I think the same bug was already here under another number.) Explanation: The text module hides the extensions as all modules do. You can change this behaviour by option: Go to Menu | Tools | Options... | System Settings | Show File Extensions and set it to true. Then you'll see all extesntions (after restart) of all files. If you woudn't like this solution and prefer showing extensions only for text files, please open thread on [nbdev] mailing list about this issue.
Resolved for 3.3.x or earlier, no new info since then -> closing.