I'm sorry, but it's impossible to know beforehand what will be the nature of the vulnerabilities that are present in the OS and won't be patched.
The fact that you run poker clients on the internet from that machine won't be very safe, and worst, it's proprietary, which means there's no way of knowing if the program uses some operating system libraries for some of the it's functions, similar for Chrome, but in Chrome's case it's easier to know. Let's take the jpg example again, do these applications have their own frameworks and libraries to handle jpgs or do they rely on the one existing in the system.
Last edited: Mar 25, 2014