That means you're not opening it with java.
Make sure you have it installed, then right click the osbot file -> open with -> if it has java in there select that, if it doesn't select other.. and navigate to where java was installed (/java/jdk.versionnumber/bin/java)
Considering I am currently studying Game Design & Development I may ask you to help you in the future, however currently we already have some artists hired
Just like you'd normally recover. You can always get the accounts back.
Then again, it seems kind of unfair to start accusing people about something they MIGHT do based on pretty much 0 evidence. I think we've all realized by now that post count has no correlation with being trustworthy. Sure, some people spamming 100pc to have a quick scam, but that doesn't mean everyone will.