You should not bother with exe files. That sounds very strange. If you have correctly installed Java run time libraries, Windows OS should know how to execute *.jar files. It seems your W10 disallow Java on your computer or Java was not properly installed. Did you perform online test of proper Java installation (not via Chrome browser!)? Did you install correct version of Java (32 or 64 bit)? Does any other Java applications run well? Try to download other Java application and run it (eg. PWCG - Pat Wilson Campaign Generator for ROF/IL-2 BOS).