We recommend that you keep the file size small, less than 1 MB if possible.į has an online WAV compressor tool for shrinking WAV files. If you have an MP3 file, you can convert it to WAV format easily using a free online tool like. The audio file must be located in the C:\Windows\Media folder of your computer.But it’s a pretty straightforward process.īefore we get into the details, there are some things you need to know. Using a custom or third-party song/music as your Windows Logon sound can get a little tricky and requires some extra effort. How to Set a Custom Sound as Your Windows 10 Startup Sound If you’d rather use a custom or third-party audio as your PC’s startup or shutdown sound, follow the steps in the next section.