Can't Open OziExplorer Files

[Ozi Tracker]

I have previously been opening OziExplorer files in RouteConverter but recently after updating and uninstalling old versions of Java RouteConverter stopped loading so I updated it also. Since updating I have been unable to load OziExplorer files and the error "could not open C:\.......\........\filename.plt since its file format was not detected" is displayed. As I don't load files other than OziExplorer I don't know if other formats are undetected. Why is it so? Java is version 7 Update 21 32 bit, RouteConverter v 2.9 32 bit Windows 7 operating system. I do have GPSBabel loaded on my computer but haven't linked it as that wasn't recommended.