[NTG-context] use plain LuaTeX in ConTeXt standalone

Hi, many context users are also luatex user, and the context standalone also contains luatex binary (windows). I input the 'luatex' in the cmd, but it can't work. The message is as follows: d:\>luatex luatex This is LuaTeX, Version beta-0.77.0-2013041621 (rev 4633) \write18 enabled. **\relax I can't find the format file `luatex.fmt'!kpathsea: Running mktexfmt luatex.fmtThe command name is D:\context\tex\texmf-mswin\bin\mktexfmt Since there is not mktexfmt in the context standalone, is that mean I can't use plain luatex in the context standalone?