Which file format is commonly used for inserting audio files into Excel using the Insert Object function? 

XLSX

MP3

TXT

JPG

MP3

The file format commonly used for inserting audio files into Excel using the Insert Object function is the WAV (Waveform Audio) file format.

The file format commonly used for inserting audio files into Excel using the Insert Object function is MP3. To insert an audio file in Excel, follow these steps:

1. Open the Excel spreadsheet where you want to insert the audio file.
2. Go to the Insert tab in the Excel ribbon.
3. In the Text group, click on the Object button. A dialog box will appear.
4. In the Object dialog box, go to the Create New tab.
5. Select "Wave Sound" from the list and click OK. Another dialog box will open.
6. In the Open dialog box, navigate to the location where your MP3 audio file is saved.
7. Select the MP3 file and click OK or Insert. The audio file will be inserted into the Excel spreadsheet.

Remember, this method specifically applies to inserting audio files using the Insert Object function, and MP3 is the recommended file format for this purpose.