Unfortunately... the Apple download site for Quicktime to play on a Windows based PC has a major spyware affixed firmly to the player. (and the same spyware is affixed to all the mirror sites for Quicktime...)

Since I hate spyware of all forms, this makes Quicktime about useless for giving access to video files. Maybe AVI? That is a basic video type that I believe both Windows and MAC support without having to download a player.