This - my post from some time ago - still the same behaviour in 13.6 (now using the release version 2.1.5 of Foobar2000):
" Foobar2000 2.0 Beta 16 - still the same bug in Directory Opus:
Selecting multiple audio files and hitting Enter in Directory Opus makes foobar2000 2.0 go through the audio files one by one and only playing the last one .