Hi,

In message "[ruby-talk:01500] Permissions bits on non-Unix platforms"
    on 00/02/18, Andrew Hunt <Andy / Toolshed.Com> writes:

|How are file permissions handled on non-Unix platforms?  From
|some brief testing it seems that all you can do on Windows is
|make a file read-only or not.  What about Mac, BeOS, etc?

Ruby on non-UNIX platforms highly depend on their UNIX (POSIX)
emulation, e.g. Cygwin, DJGPP, etc.  Behavior for UNIX depend features
are defined by the emulation libraries.