MS monitoring on PC without conversion

["stoatwizard" stoatwizard]

I sometimes record in MS because my mikes are set up that way, and save
the files as wavs putting M channel on the L track and S channel on the
R track.

Most of my field recordings are dead space or junked by aircraft etc,
so I qualify them on getting back and toss the rubbish. Trouble is when
I play the MS files I can't make any sense of the stereo without
decoding. I can do that in Audition, but it takes time. What I'd like
to be able to do is play them, and have a plugin on the PC do the
decoding on the fly, so I don't have to decode the files.

Anybody know of a way to do that, either as a plugin for something like
foobar2000 or a lightweight app?