Sony DCR-TRV39 - Manual (Page 97)

Selection menu Defines the output destination.
Card Search button
Searches for any memory cards present, either in a camera or in a
memory card reader connected to your computer.
Still Picture Display button
Displays only thumbnails of still picture files in the thumbnail list
window.
Movie Display button
Displays only thumbnails of movie files in the thumbnail list
window.
Sound Display button
Displays only thumbnails of sound files in the thumbnail list
window.
Display All Files button Displays thumbnails of all files in the thumbnail list window.