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The most common .dat files are video files from a video cd. Try playing with media player. See this also http://filext.com/file-extension/dat
A compiled Help File in Windows will have the extension .chp
A .m3u file is a playlist file - it does not contain any actual media. It simply serves as a pointer to several different media files. In order to open a .m3u file, all the media files that it points to must be in the location the file points to. Without having the actual file, it would not be possible to tell you which files need to be where. Assuming the media files being pointed to are in the correct location, media players such as Windows Media Player, Winamp and VLC Media Player should all be able to play them, assuming the file types of each file are supported by that player.
There is list of programs that support DO file extension http://www.howopen.org/en/extensions/web-files/do
The files may not be able to be played in the WMP... like the file extension .WMA, .MP3 can but .fl cant...
A file that has .xls, .xlsx, .xlsm as file extension then it is known as excel file.
You might not be able to play because of the lack of video or audio driver. The file extension could also be not supported by media player.
The main project file has a VBPROJ extension. This is also a file with the same name as the main project file, but with an SLN extension. The SLN extension is a solution file.
There is no specific file extension for MS-DOS. Files can have any 3 character extension in MS-DOS.
no
title
.rar