if the rss feed u found at gamestop contains the name of the platform, then u can use a software or a web service to filter out the items u don't need. and just publish the ones regarding the pc platform.
i use http://www.feeddigest.com/ to publish rss feeds on my blog, and it support filtering, and i think it can output just the rss for you (without the need to build a site). i am sure there many other services and software which will enable rss filtering for you.
good luck.
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