How to Choose a File Type Extension
File types are identified by a file name extension. Before defining a new file type, you should first choose a file name extension.
Instructions
Step 1:
Choose a long file name extension that you want to use to identify the file type. For more information, see File Type Handlers.
Step 2:
Check the Internet Assigned Numbers Authority (IANA) MIME database to determine whether the file name extension is already associated with another application.
Step 3:
Define a MIME type when defining a new public file type, and register it with the IANA.
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