As promised, the desktop application has been updated and a new release has been submitted to X-Aviation for uploading. Version 2.1 adds compatibility with IXEG 737 Classic Plus and X-Plane 12. There will be a significant difference with the previous version: the desktop application will no longer use its own navdata. Instead, it will be connecting to X-Plane's navdata (via the iGoConnect plugin) akin to how it works with the iOS application. Disadvantage: it will take slightly more time when getting airport or navaid information and you need to have X-Plane running. Advantage: no need to maintain several navdata files. It also includes improved SID and STAR procedures.
Since, all code related to navdata has been rewritten, it is possible that some bugs may still exist. Please let me know if you find one. I am working on updating the iOS version as well.
Thank you!