> Unlike UNIX, it's not just a matter of seeking around. You have to open 
> the file as a sparse file, then you have to say "hey, this area is 
> sparse" rather than (say) just writing all zeros to the blocks or 
> something.

Not really... Cross-platform programs that don't use any 
Windows-specific API manage to create sparse files here. That's why 
download managers that download in chunks give the option to 
pre-allocate: sparse files that are filled randomly get fragmented quite 
badly.

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