char   path[MAX_PATH];  
  GetModuleFileName(NULL,path,MAX_PATH);

GetModuleFileName(   AfxGetInstanceHandle(),szPath,MAX_PATH);


GetModuleFileNameEx  
  The   GetModuleFileNameEx   function   retrieves   the   fully   qualified   path   for   the   specified   module.    
   
  DWORD   GetModuleFileNameEx(  
      HANDLE   hProcess,         //   handle   to   the   process  
      HMODULE   hModule,         //   handle   to   the   module  
      LPTSTR   lpFilename,     //   buffer   that   receives   the   path  
      DWORD   nSize                   //   size   of   the   buffer  
  );  
     
  Parameters  
  hProcess    
  Handle   to   the   process   that   contains   the   module.    
  hModule    
  Handle   to   the   module.    
  lpFilename    
  Pointer   to   the   buffer   that   receives   the   fully   qualified   path   to   the   module.    
  nSize    
  Specifies   the   size,   in   bytes,   of   the   lpFilename   buffer.    
  Return   Value  
  If   the   function   succeeds,   the   return   value   specifies   the   length   of   the   string   copied   to   the   buffer.    
   
  If   the   function   fails,   the   return   value   is   zero.   To   get   extended   error   information,   call   GetLastError.    
   
  See   Also  
  Process   Status   Helper   Overview,   PSAPI   Functions,   EnumProcesses,   GetModuleBaseName