I've not used Windows for a long time, but in .exe format it was possible to include additional data at the end of it and read it during program execution. I am

I've not used Windows for a long time, but in .exe format it was possible to include additional data at the end of it and read it during program execution. I am relatively certain writing was not possible while the executable was running, but that I guess it could probably be bypassed by a secondary executable that does the writing and re-starts the original. Not as nice, but not sure if anything else can be done. Maybe nicer option would be to always copy the original executable, and spawn the secondary one while writing to the original. The running copy could be keeping data in memory anyway.