Downloads not combining, computer unable to play any files

[KiLaRaBiT]

Hey there!

I have recently had a problem with my nzb downlaods not combining in the destination folder and in turn, I can't play the file when it completes. I'm getting no errors and each download goes to the destination folder and creates the appropriate file but inside of the file it is just a bunch of seperate files that aren't able to be played/recognized when i click on them with no way to combine them.

[sander]

What are the extensions of those files?