What you need is HxD (a hex editor), and the homebrew app to test. Now, a file might be a boot.dol in reality, but it could just be renamed to boot.elf. If you aren't sure if it's really a boot.dol or boot.elf, follow these steps. 1. Open HxD. 2. Press Ctrl+O. 3. Navigate and select the homebrew app's executable (dol/elf) On the first line, if a boot.dol is present, it should show: 00 00 01 As the first few bits of code. On a boot.elf, they are: 7F 45 4C 46 01 02 01 Hope this helps someone. For the more technical people, these are the file signatures of any Wii .dol or .elf.