FIle I/O

[Graham Nicholls]

I'm writing a program to take a file and convert it into a binary format which
matches the format produced by a system which we use.  If I get it right, this
will allow me to "replay" the file into the system.  However I can't find how
to do I/O in D.  I've got the "D Programming Language" and "Tango" books, but
not much there, and as a C/C++ programmer, Tango doesn't seem that appealing
:-).  Is there a tutorial anywhere?
Thanks