QuickTime is Apple's media player and can play a variety of media files such as AIFF, WAV, DV, MP3, MP4, MOV other formats can be played with the addition of plugins.
It is either a Quicken Data File or a QuickTime Extension a Component used by Apple QuickTime Player; enables support for additional video codecs and file formats;
iTunes video file extensions are usually .m4v or .mp4 as well as standard QuickTime .mov files.
mac.wareseeker.com/free-quicktime-system-extension-5/
A file with the extension MOV is one that contains multimedia such as a video with music as well. One would need the QuickTime software in order to play videos with this type of file.
Depending on what format your video is, quicktime may not be able to play it. I like VLC for a video player. It plays every video format I've ever tried. It's free to download. This could also be because of the type of file it is, as mentioned before. If your computer doesn't recognize the type of file (.wmv, .mov, etc.), it will either try to open it in a program it thinks is best, or it will ask you what you want to open it in. Sometimes it is just a bad file, and cannot be played at all, even with the correct player for the extension. Also, look at the extension (.mov, .wmv, etc.). '.mov' (a common video file extension appearing after the file name) is able to be played in QuickTime, and .wmv (another common file extension) is able to be played in Windows Media Player. Look at the extension and find the corresponding Video Player that plays that extension or file type. As mentioned before, it might just be a bad file, and needs to either be redone, or redownloaded, depending on where you got it from.
What is the file extension What is the file extension
Apple's native video file format is the Quicktime File Format (.qt), which is a container for a range of encoded data types. Apple's primary encoding format is MPEG-4 (.mp4), from which a number of other codecs are derived (including 3GP).
file extension for video is 101
.html, .php, or .htm
The file extension tells about the type of file, with the extension three letters. For Eg:- *.txt -- text file *.exe-- executable file
file extension
The file extension is ".pages"