NeoFiler

- MIME settings screen -

The file extension and the MIME type registration/editing are possible.
It is necessary to put the application corresponding to the MIME type to open a file of registered extension.

Managing the MIME-type on the database.
And list it in "AndroidManifest.xml" file as follows and show it outside.

<provider android:name=".MimeTypeProvider"
    android:authorities="com.skyarts.provider.MimeType"
    android:multiprocess="true" />