> I would do it by writing to temporary files.  The reason is because 
> when you start writing to an offset in a new file, the write call 
> will block for a long time while Windows zeroes/randomizes the 
> earlier bytes so that you cant read someone elses file that was 
> previously in the same place on the disk.

With NT and better (who really cares about Win9x any more), you can 
use sparse files, where the OS creates a file (potentially larger 
than the disk) but only allocates sectors as you write them.  Once 
the file is complete, it would be copied to a normal file.  


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