[Dev-luatex] bug in os.execute?

Hello, I'm playing with LuaTeX and I found a very strange behaviour that you can reproduce with the following steps: - compile tetest.c (it's just a tiny program writing utf8 in a file with wide characters) - 'texlua tetest.lua' (it executes the program and outputs the file) - 'lua tetest.lua' - compare... Is there a way for texlua to behave like lua in this case? Thank you, -- Elie