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how can I get filesize using DOS system calls?

I don`t think there is a system call for files. ???
Then again, I still haven`t really programmed since I was 8.

http://www.ctyme.com/intr/cat-010.htm

The RBIL might help ... when 'get the file size' doesn't exist, you still can use the good old trick of seeking to the end of the file and then reading the current position.