EXE和DLL中FindResource的區別

以下的代碼在EXE中，執行無誤。可是在DLL中FindResource返回的值就為0了，我用::GetLastError()，得出的值是1813，也就是取不到資源，這是為什麼？

BOOL ExtractFile(char *szZlibFile,DWORD    dwRID)
{
    HANDLE    hFile = NULL ;
    HRSRC    hRsrc = NULL ;
    HGLOBAL hGlobal = NULL ;
    
    DWORD    dwResSize = 0, dwBytesWrite = 0, dwBytesRead = 0;
    PVOID    pRsrc = NULL, pConfigEncrypt = NULL;
    hRsrc = FindResource( NULL, MAKEINTRESOURCE(dwRID), "ZLIB");
    if(hRsrc == NULL)
    {
        MyDbgPrint("[ExtractFile] Locate Resource Error: %d\n", GetLastError());
        return FALSE;
    }
    
    dwResSize = SizeofResource(NULL, hRsrc);
    
    hGlobal = LoadResource(NULL, hRsrc);
    if(hGlobal == NULL)
    {
        MyDbgPrint("[ExtractFile] Load Resource Error: %d\n", GetLastError());
        return FALSE;
    }
    
    pRsrc = LockResource(hGlobal);
    
    hFile = CreateFile( szZlibFile , GENERIC_ALL, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
    if(hFile == INVALID_HANDLE_VALUE)
    {
        MyDbgPrint("[ExtractFile] Create %s File Error: %d\n", szZlibFile , GetLastError());
        return FALSE;
    }
    
    if( WriteFile( hFile, pRsrc, dwResSize, &dwBytesWrite, NULL) == FALSE)
    {
        MyDbgPrint("[ExtractFile] Write %s File Error: %d\n", szZlibFile , GetLastError());
        return FALSE;
    }
    CloseHandle(hFile);
    MyDbgPrint("[ExtractFile] Write %s File Success\n",szZlibFile);
    return TRUE;
    
}