@echo off
if [%1]==[] goto help
rem This checks CX register for the size. Actually, this
rem only gets the lower 16 bits of size (64k). For
rem files above 64k in size, you might want to get
rem the BX value as well (the upper 16 bits).
goto START

:START
::  build the debug script
rem rcx gets the CX register, rbx would get the BX register
echo rcx>script
rem a blank line says we don't want to change the value
echo.>>script
rem q will quit the debug program
echo q>>script
::  build cx.bat
echo echo File size is %%1 bytes hex > cx.bat
::  run debug to create temp.bat
type script | debug %1 | find "CX" > temp.bat
call temp.bat
::  cleanup
del script > nul
del temp.bat > nul
goto DONE

:HELP
echo Pass a file name as an argument, this
echo program will return the size in hex
goto DONE

:DONE
::  http://www.ericphelps.com