changing file extensions

I recently got a camera that saves files with a TLV extension that my other programs can't read.  The company says that it's really an AVI format, but when I try to rename the file with an AVI extension to replace the TLV extension I just get the filename.AVI.TLV.  How can I change the file extension using Windows Explorer (on a Windows 7 machine) or some other program?

Thanks,

Philip Simmons
philsimmonsAsked:
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Paul-BCommented:
Go to Control Panel > Folder  Options > click the View Tab, then in the listbox scroll down to where you see "Hide File Extension for Known File Types" and uncheck it. Click OK button and go back and try and rename the extension then.

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