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According to game developer WildTangent, a developer that makes small online games for casual gamers, Windows Vista breaks compatibility with games on MSN, RealArcade, Yahoo Games and AOL Games.

“Vista's incompatibility with most downloadable casual games, including those on Microsoft's own gaming portal demonstrates the enormous challenges facing many small game developers with getting their games to work with the new OS,” read a WildTangent statement.

In addition to breaking existing games, the security restrictions of the new operating system will rely heavily on ESRB ratings to block children from accessing inappropriate games. Alex St. John, CEO and co-Founder of WildTangent, and once evangelist for Microsoft’s DirectX API, believes that this represents an additional hurdle for the smaller games developers since most of these games are family appropriate but lack expensive ESRB ratings.

“Parents who choose to use Vista's parental controls are likely to accidentally block access to hundreds of very popular family friendly games that happen not to have ESRB ratings," said St. John.

St. John was eager to boast that WildTangent's new Vista-ready console includes a parental control solution that ensures parental control over downloaded content without blocking access to family appropriate content that happens to lack an ESRB rating.

“WildTangent has spent the last year preparing for Vista. We worked with nearly every major casual game developer to get their games tested and compatible with Vista in our network in anticipation of these problems,” he said.