Passolo Translator 2011 suddenly stopped opening tbulic11 bundles; Error 0208

Under W7, 64 bit Professional, last night I successfully opened the bundle and translated something as 10% of it. This morning when I tried to open it I got the Error 0208, "Cannot open (my file)". I tried to open the original (untouched) bundle and got the same message. In fact, it is no longer opening any tbulic11 bundle.

Next I tried to open the original bundle in my other PC with Passolo Translator 2011, but under W8.1. and having installed Studio 2014 long time ago. It opened with no problem.

 I recently installed Studio 2015 in the same PC.. Do you think that Studio 2015 have something to do with Passolo 2011's behavior? How could I solve the problem?