local var[100]:WORD    

local var:WORD 100 dup (?)    

Was this a design decision?

proc WindowProc uses ebx esi edi, hwnd,wmsg,wparam,lparam    

WindowProc proc uses ebx esi edi, hwnd:DWORD,wmsg:DWORD,wparam:DWORD,lparam:DWORD
  .if [wmsg]=WM_DESTROY
        invoke  PostQuitMessage,0
        xor     eax,eax
  .else
        invoke  DefWindowProc,[hwnd],[wmsg],[wparam],[lparam]
  .endif
        ret
WindowProc endp     

struct  VOCFILETYPE
        samplerate dd 0
        length     dd 0
        vocbuffer  DirectSoundBuffer
ends    

struc  VOCFILETYPE {
       .samplerate dd 0
       .length     dd 0
       .vocbuffer  DirectSoundBuffer
}    

What about a wiki for preprocessor/macro documentation? There were tons of change recently, the users contributions may leave you some free time.

locals
 alpha dd 1000
 beta db 100
endl    

format PE console 4.0

include 'win32ax.inc'

entry $

        stdcall disp,double 3.7
        cinvoke getchar
        invoke  ExitProcess,0

proc disp number:QWORD
        cinvoke printf,"%4.2f",double [number]
        ret
endp

data import

  library kernel32,'kernel32.dll',\
          msvcrt,'msvcrt.dll'

  import kernel32,\
         ExitProcess,'ExitProcess'

  import msvcrt,\
         getchar,'getchar',\
         printf,'printf'

end data    

option prologue:none
option epilogue:none    

macro prologuedef procname,flag,parmbytes,localbytes,reglist
 { if parmbytes | localbytes
    push ebp
    mov ebp,esp
    if localbytes
     sub esp,localbytes
    end if
   end if
   if ~ reglist eq
    save@regs reglist
   end if }

macro save@regs [reg] { push reg }    

macro prologuedef procname,flag,parmbytes,localbytes,[reg]
 { common
    if parmbytes | localbytes
     push ebp
     mov ebp,esp
     if localbytes
      sub esp,localbytes
     end if
    end if
    if ~ reglist eq
   forward
     push reg
   common
    end if }    

alternative:

[reg]

reglist