It does not matter which file-extension a database has to its functionality. It is just a name, so reading and writing will work the same.
Most Operating-Systems use the extension to determin wich icon to show in a file-browser or with which application to open a specific file. So choosing the right file-extensions for your database improves your workflow.
Typical extensions for sqlite3
are:
.sqlite
.sqlite3
.db
.db3
.sdb
.s3db
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