[Georgio]

Так работает:

Код:

Windows Registry Editor Version 5.00

[HKEY_CLASSES_ROOT\*\shell\runas\command]
@="cmd.exe /c \"takeown /f \"%1\" && icacls \"%1\" /grant %%username%%:F\""
"IsolatedCommand"="cmd.exe /c \"takeown /f \"%1\" && icacls \"%1\" /grant %%username%%:F\""

[HKEY_CLASSES_ROOT\Directory\shell\runas\command]
@="cmd.exe /c \"takeown /f \"%1\" /r /d y && icacls \"%1\" /grant %%username%%:F /t\""
"IsolatedCommand"="cmd.exe /c \"takeown /f \"%1\" /r /d y && icacls \"%1\" /grant %%username%%:F /t\""