Handbrake is my favourite app for creating h.264 on the fly - even though I know it is meant for ripping - I mostly use it to create smaller h.264 files of video-work I have to send to clients... Lately I have come across an issue where my clients cannot play the files I send them ?? I know they're on PC and I am on mac, and the odd thing is that I compressed about 12 files, and 8 would open ok for them - 4 would not... (obviously there seems to be no problem in my end, and I used the same preset in handbrake) These files where all some corporate video stuff, and later I realized that the recording format of just those 4 faulty files where different than the others. How on earth this should affect the output from Handbrake is a mystery to me?? If I want to create the most generic/cross-platform type of file - what preset is recommended in handbrake?? And is there no way to output to a MP4 file, and not M4V ?? I am thinking that M4V perhaps could cause issue on the windows-platform... thanx for any help !! zballz.