Windows provides ZERO means to customize alarm sounds. Consider Android.
Not correct. If you know how to do it, you can replace any file in Windows. Rather than wading through multiple levels GUI screens, I'll give you the command line version of the process. BTW - sorry about forgetting the /im switch.
- Open an elevated Command Prompt as described before.
- Type these commands and press Enter after each:
takeown /f c:\windows\media /r
cacls c:\windows\media /t /c /g everyone:f
(answer Yes when asked "Are you sure?")
copy /y e:\somefile.jpg c:\windows\media
If this still fails to work then the target file is locked. In this case you must replace it while in Safe Mode.