Dbg vs. Pdb files

Somebody asked me about .Dbg vs. .Pdb files. Basically, .Dbg files are the predecessor's to .pdb files. For managed code, you're always likely to see .pdb files. That's actually about all I know, but you can find out more here:  https://support.microsoft.com/default.aspx?scid=kb;en-us;Q121366