How to detect current executable file name?

[eGust]

I need to locate the directory of current executable file, but I 
can't find how to do that in Phobos. I tried 
core.runtime.Runtime.args[0], but failed. Is there a standard 
method of Phobos to do that? I only know the way of Windows 
(GetModuleFileName), but I think as a common task there should be 
a platform-independent way to get it in the standard library.