Help Online - Quick Help - FAQ-1163 How do I add a file extension to a Data Connector?
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File Explorer - Preview Pane - Add support for custom file extensions · Issue #22279 · microsoft/PowerToys · GitHub
4 Ways to Change a File Extension - wikiHow
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4 Ways to Change a File Extension - wikiHow
Document Based Apps, Episode 1: Document Based Apps: Defining Custom File Extensions | Kodeco
Create Your Own Custom File Type
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Create Your Own Custom File Type
How to create your own file extensions! - YouTube
