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Hell freezes over, MS Paint adds support for layers and PNG transparency
(arstechnica.com)
This is a most excellent place for technology news and articles.
There's a portable version I'm pretty sure.
When a computer is locked down by an employer it doesn't just mean you can't install software, it means that you CANNOT RUN software that isn't approved.
I've found that level of locked down to be rare, usually portable apps still work. That being said running portable apps is still risky since it's likely against company policy and could be logged by IT.