Runtime error by opening showfiles from before Cobalt

Hi, I have now The cobalt software running on my Congo Jr. and if i open some showfiles, made on Congo software 6.4, i get an Runtime error with following messages :" This application has requested the Runtime to terminate it in an unusual way. Please contact the application's support team for more information."

Sooo.. here i'm with my question, What causes this Runtime error and how can i prevent this??

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