Ken: just FYI, NSFileManager has a method you can call to see if two files are identical. If they are, you can simply throw out the new download and open the pre-existing file. I have done this in an iOS program I wrote for my work for both downloaded files and "open in..." files opened from things like Dropbox and Mail. It's only a few extra lines of code.
BrickPad 2.1.1
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BrickPad 2.1.1 - by Ken Drew - 2012-12-14, 1:50
Re: BrickPad 2.1.1 - by Paul Griffin - 2012-12-16, 7:32
Re: BrickPad 2.1.1 - by Ken Drew - 2012-12-16, 15:41
Re: BrickPad 2.1.1 - by Travis Cobbs - 2012-12-17, 0:43
Re: BrickPad 2.1.1 - by Ken Drew - 2012-12-17, 0:49
Re: BrickPad 2.1.1 - by Travis Cobbs - 2012-12-17, 0:59
Re: BrickPad 2.1.1 - by Paul Griffin - 2012-12-17, 2:04
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