I would recomend you use an older32 bit  XP computer and install the oldest version of Sonar you have on hand, You must still have your older versions?
Xp computers can be found in dark corners of just about every place that uses them. They are just tossing out about 3,000 of them here where I work.

BUN files go back to Pro Audio and WRK files. CWP files are a newer file format. 

thanks Bob Bone for helping me point out what i am actually trying to convey! seriously.
 
i did try to open these on my old 32 bit XP laptop in every version of Sonar i still have, to no avail.  and then i sold the laptop on craigslist.  but the title of my original post says that i want someone to write a little utility that opens up old bundles.  i still want somebody to write that program.

Glad to help - I would write it, if I had a clue as to what the storage layout was for them.
 
Bob Bone