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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: PNG support for Emacs on Windows
Date: Sun, 03 May 2020 19:03:36 +0300
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> From: Robert Thorpe <rt@robertthorpeconsulting.com>
> Cc: help-gnu-emacs@gnu.org
> Date: Sun, 03 May 2020 14:44:50 +0100
> 
> >> If it can't, where can I get a 64-bit version of the PNG library?
> >
> > The same place you got the Emacs binary, I guess.
> 
> You mean the version "emacs-26.3-x86_64.zip" with the dependencies
> included?

Yes.

> Are there any big advantages to using the 64-bit version instead of the
> 32-bit version?

Larger max buffer size, I guess.  Perhaps also faster operation.