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A common(or not so common :-) ) extension for c++ files is 'cxx'. It would be nice for that to be added to extension types. The best fix would be under the "Tools->Options->Object Types->C/C++ loader" properties to have the ability to set extensions recognized for C, C++, and header files.
For the ".cxx" extension, no problem I will add it. For the customizable extensions - I think about it (and I am working on it), but it will take some time.
I added "cxx" extension to the "cpplite_makefile" branch and created new build.
Target milestone -> 3.3
So, I created C/C++ Options, and they open the possibility to add custom extension to the list for each of DataObject. (OK, they do much more, but there is no doc explaining it and it is probably not much clear for the first look). For changing extensions, you can go to the: Tools/Options/C/C++ Options/${wanted_file_type}/Extension recognizer/ And there are two arrays of string: masterExt (Master extensions) - usually editable file slavesExt (Slaves extensions) - usually file compiled from one above generated