winload.exe is the (default?) «OS loader». winload.exe (as is also winresume.exe) is located in %SYSTEMROOT%\System32 and %SYSTEMROOT%\System32\Boot. C:\> bcdedit.exe /enum Windows Boot Manager -------------------- … device partition=\Device\HarddiskVolume1 description Windows Boot Manager locale en-US … timeout 30 Windows Boot Loader ------------------- … device partition=C: path \WINDOWS\system32\winload.exe description Windows 10 locale en-US … osdevice partition=C: systemroot \WINDOWS