The StackOverflow link led to a post with the cause and fix. Got it cleared up now.
https://github.com/Shendare/EQZip/releases/
Release Notes:
9/8/2015 - Version 1.4
* Fixed: Extracting from _chr.s3d archives with lots of files inside should no longer yield a "Generic GDI+ Error".
* Known Issue: Some files may still have too many files inside for C# to easily parse. global_chr.s3d is one that is known, with 1,617 files stored in it. A stack overflow occurs even when not extracting the images from the stored files for display. I'll have to put together a way to split up the processing of obscenely large numbers of files into batches.
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