this is what i do....
1, change the game dump file to .mp4.... ie killzone.vpk to killzone.mp4
use QCMA to copy it from videos from your PC ...
then rename it back to killzone.vpk on your vita & install it ....
2 copy it to psp savedata in a zip file on PC transfer to vita using QCMA...
then rename it back to VPK