I've been able to import BUN files created in Pro Audio 9 to Sonar X3 Studio, but there are some projects, typically larger ones that I have not been able to import.  Sonar goes unresponsive regardless how long I let it work.  I've taken these and broke them down into smaller number of tracks and saved as BUN file and sometimes it works.  I have some that may have only 1 or 2 tracks on them and they still won't import into Sonar X3 Studio.  It looks like the AUDIO (WAV) file is the problem.  Anyone else migrated fro Pro Audio 9 and any suggestions?
 
Frank

I have imported over 30 projects without any problem from the years 1998 to 2000.
Only the plugins were all missing.
Try to save them as cwp-files in Audio 9 - and open it in safe-mode in X3 (hold down the shift-key while opening).
 

I must be missing something.  When I try save as...  I do not have a CWP option.  I'm using ver. 9.03 Pro AUdio 9 and the options given are Normal (.wrk), Cakewalk 3.0 (.wrk), Template (.tpl), Bundle (.bun), midi (.mid) and RIFF Midi (.rmi). 
 
Any other suggestions?

CWP didn't come along until about Sonar 3. Pro Audio 9 used wrk. All will open in Platinum. 

John
CWP didn't come along until about Sonar 3. Pro Audio 9 used wrk. All will open in Platinum. 

^^^^
 
They may have changed the file extension but the file format is the same.   Pretty impressive when looking at how long this has been the case.