old/ASM/WOW.ASM

.Model Huge
.386
.Stack 100h

             .Code
             mov     ax,cs
             mov     ds,ax
             mov     es,ax

             mov     ax,3d02h
             mov     dx,offset cs:fname              ; DX=*FileName
             int     21h                             ; DOS/FileOpen
             jc      errorlbl                        ; Jump On Errors

             mov     word ptr [offset cs:fname],ax   ; BX=Handle
             mov     bx,ax

             mov     ax,4200h
             xor     cx,cx                           ; Segment
             mov     dx,36dfh                        ; Offset
             int     21h                             ; DOS/FileSeekSet
             jc      errorlbl                        ; Error !

             mov     ax,4000h
             mov     bx,word ptr [offset fname]      ; BX=Handle
             mov     cx,1                            ; Lenght
             mov     dx,offset patch1                ; Buffer
             int     21h                             ; DOS/WriteFile
             jc      errorlbl

             mov     ax,4200h
             xor     cx,cx                           ; Segment
             mov     dx,0E31Ah                        ; Offset
             int     21h                             ; DOS/FileSeekSet
             jc      errorlbl                        ; Error !

             mov     ax,4000h
             mov     bx,word ptr [offset fname]      ; BX=Handle
             mov     cx,1                            ; Lenght
             mov     dx,offset patch2                ; Buffer
             int     21h                             ; DOS/WriteFile
             jc      errorlbl

             mov     ax,3e00h
             mov     bx,word ptr [offset fname]      ; BX=Handle
             int     21h                             ; DOS/CloseFile
             jc      errorlbl

             mov     dx,offset cs:text2
             jmp     getout

     errorlbl:
             mov     dx,offset cs:text1              ; Print
     getout: mov     ah,9
             int     21h

             mov     ah,4ch                          ; Get Out Of Here !
             int     21h

     patch2  db 084H; MOV EAX,00000001 - NOP
     patch1  db 074H; MOV EAX,00000001 - NOP
     fname   db 'dsp_wt.dll',0
     text1   db 0ah,0dh,'Error Handling File'
     text2   db 0ah,0dh,'Patch By Rod',0ah,0dh,'$'
end;