As Michael has mentioned, there are several important readable marks in correct CWP file.
"Cakewalk_SONAR" ("Cakewalk SONAR", without underscore, in early versions) is very close to the beginning.
I have checked the whole file. In case important sections are still in tact, I can restore manually. And I have not found any spells there is something from real CWP. CWP has the list of used audio files, started with "fref". Not there. CWP has the list of tracks with information about clips. Not there.
Offtopic. I recommend listen
https://www.youtube.com/watch?v=VgYoFaRH114&t=5s for another way to open CWP files. Gerard makes videos, but you will recognize he does that with NVDA. I am advancing slowly, so my accessible controller framework and Sibiac are not yet moved from Sonar to the Reaper world. But in case you can benefit from accessible OSC with RME TotalMix, soon for Behrigner Digital Mixers as well, please let me know or check the link in my signature.