### Extract jagexappletviewer from MSI

Source: https://github.com/runestar/official-client-portable/blob/master/README.md

This shell script demonstrates the method used to extract necessary files like jagexappletviewer.jar, jagexappletviewer.png, and legal/jagexappletviewer.LICENSE from the official Windows client MSI installer. It involves downloading the MSI, using msiexec for extraction, copying files to specific locations, and cleaning up the JAR file.

```shell
curl -O https://www.runescape.com/downloads/OldSchool.msi
cmd.exe /c "msiexec /a OldSchool.msi /qn TARGETDIR=%cd%\msi"
cp msi/jagexlauncher/jagexlauncher/bin/jagexappletviewer.jar jagexappletviewer.jar
cp msi/jagexlauncher/jagexlauncher/oldschool/jagexappletviewer.png jagexappletviewer.png
cp msi/jagexlauncher/jagexlauncher/LICENSE.txt legal/jagexappletviewer.LICENSE
zip -d jagexappletviewer.jar MacOSXHelpers.class
```

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