If you don't know how to extract 7z or rar files, use 7-Zip. If the start button is for Windows 7 (there are three buttons in one image) and you want to use it in Windows 8.1+, use Windows 7 to Windows 8.1 Start Button Converter.
If the downloaded contains only the exe file without the original bitmap, you'll have to extract the bitmap:
- Download and run CustomizerGod.
- Press Ctrl+O and open the exe file that you downloaded earlier.
- Select the new Bitmaps option that gets listed in the left-hand pane.
- Select the start button and click Export Selected Resources.
Want to list a start button here? Contact me.