ZDoom .DLL Question

I am having a problem running ZDoom. Everytime I drag a .WAD into ZDoom.exe, it gives me an error that says; "A necessary .DLL file, FMOD.DLL is missing."

Could someone please explain to me what the problem is. Thank you.

You need to use a shortcut for the drag-n-dropping. And make sure to set the shortcut's working directory to the directory where ZDoom is.

Here, try this. It has the ZDoom exe, wad, and the fmod.dll you're after.