How do I change the default file extension used by the "Save As" option?
Answer 1. How to change the default file extension
File | Save As" option, the .htm file extension is added by default, if no other file extension or file type is specified.
Edit | Preferences | File Types".
Answer 2. How to change the default save as extension to *.html from *.htm
Edit | Preferences | File Types | Default extension" to html (without a . or a * in the front of the extension).
Edit | Preferences | File Types | Default" can also affect the final file extension appended to the file name. If HTML Files (*.htm; *.html) is the currently selected file type (note how *.htm is listed before *.html), pick HTML Files (*.html; *.htm) from the drop-down menu so that *.html is listed first.