Where is the button to add the extension to the file name? getting to old I forgot.

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Where is the button to add the extension to the file name? getting to old I forgot.

Thanks
D.
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Follow-Ups:
- Re: Where is the button to add the extension to the file name? getting to old I forgot.
  - From: Dave Patrick
- Re: Where is the button to add the extension to the file name? getting to old I forgot.
  - From: Dave Patrick