So this, I admit, is a bit embarrassing to ask. I am trying to make a custom resource pack, and I need to be able to open the JAR files. The computer I'm using has nothing on it to extract files.I looked for Winrar but could only find a $30 version and the rest of the links I didn't know whether to trust.I need to know what to download to do this with, and the proper link (if possible) for the download.Here's the thing: It needs to be free.. and more than anything else it needs to be safe. I am currently using a shared computer which doesn't belong to me. I need to get the right program in the first time and not mess anything up.So I'm reaching out to the community for direction.