Subtitle Workshop supports all the subtitle formats you need and has all the features you want from a subtitle editing software.
Some of the features are the following: user friendly interface, can handle both time and frame based subtitles, massive subtitle conversion, can check for and fix errors in subtitles, can get frame rate from a movie file, associates itself with the subtitles extensions you want, adjust subtitles, recent files list, etc.

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http://multi.takefile.org/320872682