Hello folks, thanks for the prompt replies!  As @scook suggested, changing the file extension back to .cwb worked perfectly, and SONAR opens it perfectly.  Thanks so much!
 
	 
 
	As a side note, I am obviously a completely new poster here, and I am thus unaware of any cringe-worthiness of the Cakewalk bundles as your forum mythos or etiquette.  FWIW, I have been using SONAR since 2004 (starting with version 2.2) and currently run SONAR PRO (have not upgraded to Bandlab, sorry [not sorry]).  I've always felt Bundle files were absolutely fine for archival purposes as well as a mental signifier that says "OK, this track is complete.  I can be done now."  Project files are for something you are currently working on.  Knowwhatimean?  This has been the only problem I've had with a bundle, aside from a damaged CD-R that made the bundle data file corrupted. 
 
	 
 
	To each their own, I suppose.  Regardless, thanks.  Someone needs to tell Google Drive to get their sh!t together!