Insolvency proceedings have been opened into the affairs of René Benko, founder of Austria’s Signa Holding real estate company, a spokesman for the Innsbruck court said on Friday. The decision opens the way for Benko’s assets to be evaluated. Last year, Forbes put his worth at $6 billion, but the US business magazine has since taken him off its billionaires list. Klaus Schaller of Austria’s KSV 1870 creditors association told dpa that Benko’s current worth is not clear. Assessing the claims on Signa’s assets would be of interest, Schaller said. Benko has until now maintained silence on his rol…