(adsbygoogle = window.adsbygoogle || []).push({}); Can anybody help me with something I want to be able to use an openfiledialog to select a zip that copy its files into a minecraft.jar folder to make a mod installer from there i could start adding features myself.

This is in C#, use an online converter.

Considering nobody has answered your question yet, let me do this.
You'll have to use a library that I will link you to, use a youtube tutorial about adding libraries to your project.

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Make sure you reference the System.IO assembly and the DotNetZip library.

First of all extracting the input zip file to a temporary location:-

      private void ExtractArchive(string archiveName, string directory)

  {

      using (ZipFile zipFile = ZipFile.Read(archiveName))

          foreach (ZipEntry e in zipFile)

            e.Extract(directory, ExtractExistingFileAction.OverwriteSilently);

  }

Example usage: ExtractArchive("xray.zip", Directory.GetCurrentDirectory());

Now we just have to add these files to our JAR archive.

      private void InsertFolderContentsIntoArchive(string archiveName, string directory)

  {

      using (ZipFile zipFile = ZipFile.Read(archiveName))

      {

         string[] directoryContents = Directory.GetFiles(directory);



         foreach(string s in directoryContents);

           zipFile.AddFile(directoryContents);



         zipFile.Save();

      }

  }

Example usage: InsertFolderContentsIntoArchive("location/to/.minecraft/bin/minecraft.jar", "C:/example/folder");

Note: InsertFolderContentsIntoArchive only gets the files from the directory's root, none of the files inside of sub folders will be added. If you want it to add folders and sub-folder content then just use Directory.GetDirectories(string directory) and then add the folder results from it before scanning those directories and so on.

I rewrote portions of the code I took from the DotNetZip website.