Issue installing

[Oaksatyr666]

I just got my first pc and i wanted to start playing pixelmon but my issue is that whenever i try installing it keeps coming up with the error of "this file doesn't have an app associated with it" and i was hoping someone would be able to help me get past this issue

[Oaksatyr666]

so i seemed to fix that specific issue but now my issue is that im unable to open it with java, it opens a small pop up but then immediately closes said window