As far as I know, this was a component that was licensed from a third party. The company sold the editor separately as well IIRC. So, even if there are no legal

As far as I know, this was a component that was licensed from a third party. The company sold the editor separately as well IIRC. So, even if there are no legal hurdles to reverse engineering the file format, delving into an undocumented format developed by a different team and no previous information is tough. This means a lot of money and effort for something that comparatively few people really need. I am not surprised that they didn't do that.