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   .386
   .model flat,stdcall
   option casemap:none
   
   include      windows.inc
   include      user32.inc
   include      kernel32.inc
   include      shell32.inc
   includelib   user32.lib
   includelib   kernel32.lib
   includelib   shell32.lib
   
   WM_SHELLNOTIFY      equ WM_USER+5
   IDI_TRAY         equ 0
   IDM_RESTORE      equ 1000
   IDM_EXIT         equ 1010
   
   WinMain PROTO :DWORD,:DWORD,:DWORD,:DWORD

   .data
   ClassName      db "TrayIconWinClass",0
   AppName      db "TrayIcon Demo",0
   RestoreString   db "&Restore",0
   ExitString   db "E&xit Program",0

   .data?
   hInstance      dd ?
   hPopupMenu   dd ? 
   note NOTIFYICONDATA <>   

   .code
   start:
       invoke GetModuleHandle, NULL
       mov    hInstance,eax
       invoke WinMain, hInstance,NULL,NULL, SW_SHOWDEFAULT
       invoke ExitProcess,eax

   WinMain proc hInst:HINSTANCE,hPrevInst:HINSTANCE,CmdLine:LPSTR,CmdShow:DWORD
       LOCAL wc:WNDCLASSEX
       LOCAL msg:MSG
       LOCAL hwnd:HWND
       mov   wc.cbSize,SIZEOF WNDCLASSEX
       mov   wc.style, CS_HREDRAW or CS_VREDRAW or CS_DBLCLKS
       mov   wc.lpfnWndProc, OFFSET WndProc
       mov   wc.cbClsExtra,NULL
       mov   wc.cbWndExtra,NULL
       push  hInst
       pop   wc.hInstance
       mov   wc.hbrBackground,COLOR_APPWORKSPACE
       mov   wc.lpszMenuName,NULL
       mov   wc.lpszClassName,OFFSET ClassName
       invoke LoadIcon,NULL,IDI_APPLICATION
       mov   wc.hIcon,eax
       mov   wc.hIconSm,eax
       invoke LoadCursor,NULL,IDC_ARROW
       mov   wc.hCursor,eax
       invoke RegisterClassEx, addr wc
       invoke CreateWindowEx,WS_EX_CLIENTEDGE, ADDR ClassName, ADDR AppName,\
          WS_OVERLAPPED+WS_CAPTION+WS_SYSMENU+WS_MINIMIZEBOX+WS_MAXIMIZEBOX+WS_VISIBLE,CW_USEDEFAULT,\
          CW_USEDEFAULT, 350, 200, NULL, NULL, hInst,   NULL
       mov   hwnd,eax
       .while TRUE
         invoke GetMessage, ADDR msg,NULL,0,0
         .BREAK .IF (!eax)
         invoke TranslateMessage, ADDR msg
         invoke DispatchMessage, ADDR msg
       .endw
       mov eax,msg.wParam
       ret
   WinMain endp

   WndProc proc hWnd:HWND, uMsg:UINT, wParam:WPARAM, lParam:LPARAM
       LOCAL pt:POINT
       .if uMsg==WM_CREATE
         invoke CreatePopupMenu
         mov hPopupMenu,eax
         invoke AppendMenu,hPopupMenu,MF_STRING,IDM_RESTORE,addr RestoreString
         invoke AppendMenu,hPopupMenu,MF_STRING,IDM_EXIT,addr ExitString
       .elseif uMsg==WM_DESTROY
         invoke DestroyMenu,hPopupMenu
         invoke PostQuitMessage,NULL
       .elseif uMsg==WM_SIZE
         .if wParam==SIZE_MINIMIZED
           mov note.cbSize,sizeof NOTIFYICONDATA
           push hWnd
           pop note.hwnd
           mov note.uID,IDI_TRAY
           mov note.uFlags,NIF_ICON+NIF_MESSAGE+NIF_TIP
           mov note.uCallbackMessage,WM_SHELLNOTIFY
           invoke LoadIcon,NULL,IDI_WINLOGO
           mov note.hIcon,eax
           invoke lstrcpy,addr note.szTip,addr AppName
           invoke ShowWindow,hWnd,SW_HIDE
           invoke Shell_NotifyIcon,NIM_ADD,addr note
         .endif
       .elseif uMsg==WM_COMMAND
         .if lParam==0
           invoke Shell_NotifyIcon,NIM_DELETE,addr note
           mov eax,wParam
           .if ax==IDM_RESTORE
             invoke ShowWindow,hWnd,SW_RESTORE
           .else
             invoke DestroyWindow,hWnd
           .endif
         .endif
       .elseif uMsg==WM_SHELLNOTIFY
         .if wParam==IDI_TRAY
           .if lParam==WM_RBUTTONDOWN
             invoke GetCursorPos, addr pt
             invoke SetForegroundWindow,hWnd
             invoke TrackPopupMenu,hPopupMenu,TPM_RIGHTALIGN,pt.x,pt.y,NULL,hWnd,NULL
             invoke PostMessage,hWnd,WM_NULL,0,0
           .elseif lParam==WM_LBUTTONDBLCLK
             invoke SendMessage,hWnd,WM_COMMAND,IDM_RESTORE,0
           .endif
         .endif
       .else
         invoke DefWindowProc,hWnd,uMsg,wParam,lParam
         ret
       .endif
       xor eax,eax
       ret
   WndProc endp

   end start


Error   A2071   initializer magnitude too large for specified size   TrayIconWinClass   

Even ml.exe 6.14 don't give any errors.
Can you zip your source file for us and we can check it ?

here is source file！ thanks!

Assembles fine. Which assembler are you using, and which commandline?

=>>   VS2015

It looks like I have to change it to real Masm32 RadASM