Jim,
On the older computers you would have used the DOS Window, while allowed you to merely open the folder and type: ren *.mid *.sty and press enter. This essentially told the computer to change every midi file in the folder to a style file.
The same holds true if you were to type: ren *.sty *.mid and press enter. It would change every style file in the folder to a midi file.
In Windows XP this is called the Command Prompt, which can be accessed via: Start/All Programs/Accessories/Command Prompt.
Cheers,
Gary
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Travlin' Easy
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K+E=W (Knowledge Plus Experience = Wisdom.)