TMP is a temporary saved video created by Windows Movie Maker. This is the file created when you save a timeline you are not yet ready to export to a video file. Once the you have finished editing the video in Windows Movie Maker you need to export the video to a standard video clip. This allows you to play the video clip in outside media players, such as Windows Media Player.
Load Windows Movie Maker. Once the video editor loads select "File," "Open Project" and select the TMP file you want to create a video clip of. In a moment the project loads onto the screen.
Click "File," "Save Video as" (instead of "Save Project). A video export window appears on the screen.
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Title the video file, select a location to save the file to, then click the format pull-down menu. Choose a video format such as WMV, MPEG or MOV (all formats Windows Media Player understands). Click "OK" and the video file exports to the computer.
Launch Windows Media Player, click "File," "Open" and choose the video file you just exported. Click "Play" and the video file begins to play on the computer.