modify winnt.exe and *.sys file

[FixHELL]

hey folks help me to modify "WINNT.EXE" , i need to know to know which program can modify "WINNT.EXE" like "Resource Hacker" do. But "Resource Hacker" do not modify ms-dos application (WINNT.EXE) plus i need to know can we modify *.sys file.