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Sorry for the delay.  Paul is certainly correct that the only 
thing you can reliably do with a tell() result from a file opened 
in text mode is seek() to it later.  Arithmetic on tell() results 
makes no sense for text-mode files.  That's ANSI C rules, and 
they matter on Windows.

Since we're going on two years without a patch here, sounds 
like changing the docs is better than nothing.