Guide
Open a Reaper Project in Adobe Audition
Audition can open an OMF file as a multitrack session, which is what the converter makes from your Reaper project.
Go to File > Open and select the .omf file — Audition opens it as a multitrack session.
OMF only supports mono clips, so stereo items arrive as pairs of mono tracks (.L and .R) that you can re-pair on the Audition side.
You can convert your Reaper project to OMF for free here.
Going the other way? Here's how to open an OMF file in Reaper.