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Do you know of any application that could define the application for opening different file types? For example, setting a default application that would open .reg files. Or if there is not any then what do I do to set it?

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which operating system? – RJFalconer Apr 22 '10 at 9:10
up vote 1 down vote accepted

WinXP and below;

Tools, Folder Options, File Associations

Win Vista and above;

Start, Control Pannel, Default Programs,
"Associate a file type or protocol with a program"
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