Those are file extensions. You can look them up with google.
MPG, MPEG, a standard internet movie platform.
MOV, QuickTime Movie, Apple Macintosh native movie platform
AVI, Audio Video Interleaved - Windows movie file
MP4, MPEG-4 Video File
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and why am I only able to view the ones marked avi? Someone please help me.
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Probably a codec problem. See this thread:
CODECs list for Movies/Alternate players / Video help forums/ video-mp3 fixers. Consider trying
VLC media player It has the codecs built in and can play most file types.