My "project file" was `e.bat` with `edit file1.cpp file2.cpp file3.cpp`, as it was one of the few editors that I knew that had a decent multi file support with easy switching (alt-1,2,3 ..). I still continue remapping editor keybindings to switch to files with alt/cmd-1,2,3,.. and try to have my "active set" as few of the first files in the editor
It wasn't a great code editor, as it didn't have syntax highlighting, and the indent behaviour wasn't super great (which is why in my early career had my indent was two spaces, as that was easy enough to do by hand, and wasn't too much like tab). But I felt very immediate with the code anyway.
I knew that many others used editors like `qedit`, but somehow they never clicked with me. The unixy editors didn't feel right in dos either.
Quickly trying this, it doesn't seem to switch buffers with the same keybindings, even if it does seem to support multiple buffers.