I have some older KDevelop projects that I am trying to recompile.  The problem is that KDevelop4+ will not open .kdevelop files.  Only .kdevelop4 files are listed when I select open project.Is there any way that I can open my projects so that I can work with them again?
Opening old KDevelop files
kdevelop
Run kdevelop /path/to/kdevelop/file.kdevelop in a terminal.  If you run KDevelop from the command line, it opens the file just fine.