Thread: Help with editor windows with win api

I want to create a basic file editor that allows you to edit a few fields from one of a game's creature files (a binary file) then resave that file. Fields editable should be things like hitpoints and resistances. The location for these things (for example offset 0x0024 is a (word) that determines current hit points) are known in the file, and the information's datatype is known also, for example a byte for the resistance values. How do I create an edit window with win api that allows me to read in the original values, then change and save the new values. I can create dialog windows off the main menu but it is a hassle to do one for every thing that needs to be changed, since their are several fields to change.
Below is my code from the resource file which is how I am listing the windows now, but there has to be an easier way. If it is possible, I would like to have several editable windows open at once, with the original creatures stat values displayed in each. Thanks in advance for any help!

Code:

MAINMENU MENU

{
 POPUP "&File"
 {
  MENUITEM "&Open...", CM_FILE_OPEN
  MENUITEM "Save &As...", CM_FILE_SAVEAS
  MENUITEM "&Clone", CM_FILE_COPY
  MENUITEM "&Paste", CM_FILE_PASTE
  MENUITEM SEPARATOR
  MENUITEM "E&xit", CM_FILE_EXIT

 }

 POPUP "&Help"
 {
  MENUITEM "&About", CM_ABOUT
  MENUITEM "&Help!", CM_HELP
  MENUITEM "&Tutorials", CM_TUTS
 }

 POPUP "&Edit"
 {
  MENUITEM "&Max HitPoints", CM_HIT
  MENUITEM "&Current HitPoints", CM_CUR_HIT
  MENUITEM "&Fire Resistance", CM_FIRE
  MENUITEM "&Cold Resistance", CM_COLD
  MENUITEM "&Lightning Resistance", CM_LIGHT
  MENUITEM "&Magic Resistance", CM_MAGIC
  MENUITEM "&Crushing Resistance", CM_CRUSH
  MENUITEM "&Slashing Resistance", CM_SLASH
  MENUITEM "&Piercing Resistance", CM_PIER
  MENUITEM "&First Class", CM_CLASS
  MENUITEM "&Second Class", CM_CLASS2
  MENUITEM "&Third Class", CM_CLASS3
  MENUITEM "&Level in First Class", CM_CLASS1LVL
  MENUITEM "&Level in Second Class", CM_CLASS2LVL
  MENUITEM "&Level in Third Class", CM_CLASS3LVL
 }
 POPUP "&Generate"
 {
  MENUITEM "&Generate random cre stats based on level", CM_GENERA
  MENUITEM "&Auto generate for all cre levels up to 20", CM_AUTOGEN
  MENUITEM "&Auto generate stats until specified cre level", CM_AUTOGENLEV
  MENUITEM "&Auto generate stats, custom defined", CM_INPUTCUSTOM
 }
}