Christian B said: For running a 4th edition game I wrote an addon to Masterplan that allows me to extract the monster stat blocks from encounters, and then some API scripts that will import them into Roll20. API Github Readme says: As Masterplan is dead and gone, along with all its offial documentation, this project owes a huge amount to the blog: <a href="http://paigew.wordpress.com/2010/11/01/creating-a-masterplan-add-on-part-1/" rel="nofollow">http://paigew.wordpress.com/2010/11/01/creating-a-masterplan-add-on-part-1/</a> which is the last remaining documentation on how to write an AddIn and even more to the coder guillaumejay. Out of curiosity, is the MasterPlan program for 4E still used by people, or is it truly dead, gone and forgotten, apart from you making this script? I find it interesting to write compatibility tools for a program that is gone since at least 2016(according to Web Archives ), but I guess you did it for your own use, and shared about it here in the extremely rare case anyone might have use for it. Web Archive have saved a July 2016 version of the MasterPlan.zip , if anyone else intend to look into it. The Downloads page indicates other programs are needed to make it work I've intended to look into how APIs and sheetworkers that are made for importing stats to Roll20, and am considering creating one myself at some point. But haven't found yet any example of minimalist implementations yet, so haven't go around to try getting started, other than noting down API/scripts that already do so. Seems like json-based import would be the easiest to make, as long as you can have the content to be imported as .json