I have never used the Nikon format, but I think the extension is unimportant. The Help file states "All of these changes automatically ignore the filename extension, as it's usually dangerous to change the extension for a file. However, you can change the extension case to a fixed extension, or add a "secondary" extension, and you can also remove an extension. You can choose to ignore extensions within folder names - e.g. treat Program.Files as a normal filename - but not filenames."
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