Here's our Windows XP Tip for.. November 15, 2006
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Save it as a Reg File
When you tell Notepad to save a file such as *.reg, the file is saved as *.reg.txt. It appears that Notepad insists on using the .txt extension. You have to change the file's name to make it a working REG file. You're not missing anything.

The workaround is to enclose the new name in quotes. For example, to name your file Regfile.reg, choose File, Save As and then type in

"Regfile.reg"

and click Save. This should solve the problem.