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I've now tried to reinstall it twice, and it still doesn't work. The minecraft_server.1.12.2.jar file executes and runs everything without any errors, but the highlighted forge-1.12.2-14.23.1.2562-universal.jar file will do nothing whatsoever when I try to open it. No window appearing, no nothing. Any ideas as to what can be causing this? I've updated Java and Java SE Development kit etc. So this can't be causing the issue either. Thanks in advance.