Question [Q] facebook messenger ding notification - computers

Other than "switch it off" which i don't wish to do,
is there any way of change the annoying Facebook notification "ding" on a windows computer, like you can on an android phone?
On a phone you can select your choice of notification sound.
Don't understand why this ability was never thought of for laptops/computers?
Windows just gives the option to have it on (with default "ding") or switch it off.
Where does it sit on a coputer? It's not part of system-sound set up, i've tried that. Surely if there are ways of changing your Windows 7 start up sound, someobody somewhere must know who to do this?
Surely there's a regedit or resource-hacker solution

Stephen