cant open .jar files

[fart n run 0]

so i play on a work laptop, its password protected when i try to install anything, system admin told me i can install whatever doesnt require admin password, and i cant instal java thing to run ,jar files.
i was wondering if there is a way for me to download the game files in a folder and just run it without having to open .jar

i was able to download gamefiles for other rsps last week but i want to comeback to simplicity but cant get the game, hope zou understand what im trying to explain couse me no speak english good hehe.

thanks