That's an old file left over from when they used to use the Retro64GameLoader.
The plugin they use now is pretty damn secure. http://www.siteadvisor.com/sites/igloader.com/downloads/3012993/
On September 1, 2006, the United States Computer Emergency Readiness Team issued an advisory concerning Miniclip.[8]. "The Retro64 / Miniclip CR64Loader ActiveX control contains a buffer overflow vulnerability. This may allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system. ... Although the ActiveX control is no longer in use by either retro64.com or miniclip.com, any system that has used certain pages of these web sites in the past may be vulnerable." None of these reports showed any hostile activity.
The plugin they use now is pretty damn secure. http://www.siteadvisor.com/sites/igloader.com/downloads/3012993/