ntoskrnl.exe and wmv files

[fancyclown]

Hi!
I've been trying out outpost security suite and it is working great so far. One thing thats bother me though is that I get a question about ntoskrnl.exe when i open some of my wmv video files. I press block every time because I don't understand why it comes up I tried googling to see if anyone else got the same problem but found nothing. I've attached a screenshot of the popup below.

/Please help

EDIT: I see now that the popup comes up for mkv and avi too?! Should i allow this or what?