on run
    set savedDelimiters to AppleScript's text item delimiters
    set AppleScript's text item delimiters to "|"
    set sourceFolder to choose folder with prompt "Please select directory."
    tell application "System Events"
        set itemList to (POSIX path of every disk item in folders of sourceFolder whose name extension is "VOB" as string)
        log itemList as string
    end tell
    set AppleScript's text item delimiters to savedDelimiters
end run

get POSIX path of every disk item of every folder of alias "Macintosh HD:Users:USERNAME:Desktop:test2:" whose name extension = "VOB"
    --> {{"/Users/USERNAME/Desktop/test2/VIDEO_TS/VIDEO_TS.VOB", "/Users/USERNAME/Desktop/test2/VIDEO_TS/VTS_01_0.VOB", "/Users/USERNAME/Desktop/test2/VIDEO_TS/VTS_01_1.VOB", "/Users/USERNAME/Desktop/test2/VIDEO_TS/VTS_01_2.VOB", "/Users/USERNAME/Desktop/test2/VIDEO_TS/VTS_01_3.VOB", "/Users/USERNAME/Desktop/test2/VIDEO_TS/VTS_01_4.VOB"}}

log rest of itemList as string