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can you attach your code? I can't reproduce your error. did you set `MLaunchOption` properties?
> use the translator yourself, github is not only english-speaking, it is also open to other countries. And on the wiki, the owner in Chinese can write ... lmao yes...
@JustAwesomeDanny I created wiki repository. please submit a pull request to here https://github.com/AlphaBs/CmlLib.Core-wiki
I updated all documents you contribute. Thank you so much again!
please post your code here
Older version just ignores exception when extracting native library is failed. On newer version, it throws exception to make it easier to find the cause when the launcher has problem....
In `/version//.json` file, you can check all libraries on `libraries` property. In each object of array, if there is `natives-windows` property, it is native library. 
it's impossible to launch version that does not exist in your pc. you should download your files into game directory
I installed Optifine_HD_U_G6_pre1 from official download site but I can't reproduce your error. can you send me .meloncher folder?
okay I will update it. by the way, it should work even if 1.12.2-Optifine_HD_U_G6_pre1.jar is not exists. v3.3.3 will download 1.12.2.jar from mojang server and locate it /versions/1.12.2-Optifine_HD_U_G6_pre1/1.12.2-Optifine_HD_U_G6_pre1.jar