Files in contents folder not appearing

I found an Sound object in a free model with the SoundId rbxasset://sounds//electronicpingshort.wav. But when I looked in the contents folder, the file is not there?

Another example is rbxasset://textures/GunCursor.png, which is used as a mouse icon in many gears. But the file does not exist in contents?

Bump as I literally cannot find a single thing on this online