What and where is the dll that has these icons in Windows 7?

Question

What is the DLL that has these icons (play, stop, pause), or something like this, and where is it located in Windows 7?

Answer 1

The only place I see these is at the Icons-Land site.
They have a $40 price tag there... wouldn't expect them to be already present in Win7 somewhere.

Version:    1.0
Series:     Software Icons, Web Icons
Count:   17
Variations: 459
Formats:    .PNG, .ICO on request
Colors:     TrueColor + Alpha
Sizes:   16x16, 24x24, 32x32, 48x48, 64x64, 128x128, 256x256
Price:   40 USD