Ya the bundle files are known to cause issues.
What you can try and do is use windows search and use the names you tagged your audio tracks- example " Lead Guitar 1" or " Vox 1 "
You'll soon find were they are all hiding.
I had to stop using Sonar's pathways along time ago as for me they didn't always seem to work.
The safest way I have found to NEVER loose tracks is to use
windows to create the folder where you will store the album. Within this folder once again create a folder for each song.
Open a template that you will use, and do a "save as CWP" and browse to the song folder you just created and name the song. Cakewalk will create an Audio folder inside that folder. Now everything is where it belongs. Forever.
Now you can start recording the song, But make sure you give each audio track a title that is easily identified. There no point in having a million track 1 , 2 and 3's.
For back up you can drag and drop the album or song folder to a second drive or do another "save as" and direct to a second drive... make sure you check copy audio with folder. I always have at least 3 copies of any given song stored. I use a folder with the date in the second and third drives.