Thanks in advance
This is weird and non-related to freemind. There is nothing such in last update for me.
My bet your host system is trojaned, and/or you've download redirected/repacked download.
Btw, freemind is running in Java, so there's no exe files except small starter app (and uninstaller). But even that exes are not required, so you can safely remove them (you'll have to start FreeMind by other means, for example, batch file).
You can download Java from official Oracle repository, and then use FreeMind from zip, w/o starter and installer/uninstaller executables.