That feature (env variables in BoxedApp Packer) allowed us to answer very easily to those needs, that would have otherwise require some scripting or additional developments. Finally, we did not have to change one single bit in our original EXE. I can also testify that the BoxedApp product team has been quite efficient, with a cycle time of a few hours (well, maybe you know some software companies who have support cycle times of months, if ever …)