I've had the same problem for about two years. Finally found a safe, reliable program from iDealshare that will convert .qcp files to just about any audio file format you want. Go to:
http://www.idealshare.net/qcp-converter.html
Unfortunately, you do have to pay for the software. Don't bother with the free trial version as it's basically only good for one file. They offer two payment options:
A: Unlimited use for 1 year = $29.99 (now thru 03/31/14; reg $39.99)
B: Lifetime use for $49.99 (now thru 03/31/14; reg $59.99)
I purchased the 1 year option as I only have so many .qcp files and don't anticipate acquiring any more. The program is fast and simple to use. You can also convert video and other file formats.
I've downloaded several free programs that claimed they can convert .qcp files but, not only did they not convert the files, they left a bunch of spammy programs on my computer that got my OS all outta whack, so I think this is well worth the money.
Hope this helps!