Thank you CapableMetal for all that info, especially confirming the plugin marks the channels wrong.

However, one point in your methodology I disagree with -- the stretching part. I believe the more elegant solution would be to first change the samplerate to 44056 without resampling (= playing the soundtrack 0.1% slower), and THEN resample to 48000 with your favorite SRC (iZotope probably). The difference might be negligible, but should avoid any possible artifacts resulting from stretching.