[kej]

Would this be for running 16 bit programs on 64 bit Windows, or is there another use case I'm not thinking of?

[lnternet]

There are quite a few older Win32 games that won't run on modern Windows systems despite the built-in compatibility modes.

[simlevesque]

If these games say they need "*.dll" to run, you can copy it from Wine into the game folder and the game will run. YMMV.