.RSF File Extension

To create an RSF file with the Sound Editor tool in LEGO MINDSTORMS EV3:

1. Select Tools → Sound Editor.
2. Record the audio.
3. Click Save, name the recording, and click Ok.

After saving the sound, the software creates an RSF to store it in an .EV3 project. To view your RSF file(s) in a project, go to your project, click the wrench icon, and select the "Sounds" tab.

To export an RSF file from a project and share it with other users:

1. Click the wrench icon in the upper left of the Project screen in the application.
2. Select your RSF file under the "Sounds" tab.
3. Click Export at the bottom of the window, name your file, choose the save location, and click Save.

You can open RSF files with the LEGO MINDSTORMS EV3 (the Home and Education versions) in Windows or macOS. However, you cannot double-click an RSF file to open it, you must import it.

To import an RSF file:

1. Cick the wrench icon in the top-left of the Project screen in the application.
2. Select the "Sounds" tab and click Import in the bottom of the window.
3. Navigate to the RSF file, select it, and click Open.