access to Cakewalk Pro Audio .BUN files

Hi Forum!
 
I'm new on this forum.
I am Mario Walzberg, a musician and recordist.
A decade ago I worked with Cakewalk Pro Audio (version 8 or 9?) on an Windows XP configuration.
I stepped over to Cubase after that (and didn't step up to Sonar as well).
I created many projects in Cakewalk wich I still have, but only as .BUN files.
Unfortunatily I cannot access these .BUN-files anymore, because Cakewalk will not install under Windows 7 (and I do not have Windows XP anymore). Even simulator-mode in Windows didn't do it.

Can anyone help me to access the .BUN-files so that I can export the waves and midi in them?
Thanks for a reply in advance!
Greetings, Mraio Walzberg