Yesterday's announced update to Valve's Steam digital distribution service came with a surprise - hints that the Half-Life developer may be planning to add Mac OS X support to the currently Windows-only platform.
Steam forum members dug through newly released files from the recently launched open beta and dug up a handful of Mac OS X-specific graphics, like the open, maximise and minimise jewel icons that are used in the operating system's windows. While that could be chalked up to Steam's change to a WebKit-based interface - Valve has moved away from a reliance on Microsoft's Internet Explorer for the service - there are a few other Mac-specific graphics buried within. That includes system dock graphics and a handful of text files.
We've reached out to Valve to see why the developer has added OS X graphics to Steam, but have not yet heard back.
Mac OS X Support! [Steam Forums]