I'm trying to install OptiFine on minecraft and I'm taking the following steps:

  1. Open minecraft with archive manager
  2. Delete the Meta-Inf folder
  3. Open OptiFine with archive manager
  4. Copy contents of OptiFine to minecraft archive
  5. Close both archives
  6. Open minecraft with java -jar minecraft.jar
  7. At this point I get `Invalid or corrupt jarfile minecraft(1) (copy).jar!

Even just deleting the meta-inf folder gives me this error. I'm on linux mint 12. Any help is greatly appreciated!

  • 1
    The problem may be outside the minecraft.jar. Try this: backup your .minecraft folder; delete it; load fresh minecraft; do what you wanted to do. – Olegs Jeremejevs Dec 24 '11 at 13:41
  • What archive manager are you using? – Kenan Dec 24 '11 at 23:30

You must rename it to: minecraft.jar.


You need to make sure your jar is named minecraft.jar

I would suggest deleting your bin folder and letting Minecraft download a fresh copy before trying this again.

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