ref: 05ed1c55a1c43b8746c7d4ca5efd7641b3ba80e9 dir: /plugins/foo_mp4/compiling.txt/
How to compile foo_mp4.dll: Extract the 2 directories (\foobar2000, \pfc) from the foobar2000 SDK to this directory, open the foo_mp4 project for VC and compile.