Dynamo extension .DYF* instead of .dyf

Hi, I’m a masterthesis student at KULeuven. For my thesis I develop a optimization tool in Dynamo.

Dynamo was abruptly interrupted when developing a custom node. After reboot, the custom node opens as a .DYF*-file instead of the usual .dyf

After the abrupt ending, the .dyn script was renamed to .dyn*

The .dyn script is based on the NSGA-II algorithm (Optimo Package). And includes multiple logic-nodes and a LoopWhile node. Could the problems come from this?

Who has ever experienced such problems in Dynamo? How did you solve them? What does the capital letter extension mean? Does “*” mean an error in the script?