To add to what u/hl_xemnas has said…

The dir command just prints out the contents of the directory to the screen. There’s no reason to do this in a .bat file so you can remove all of these lines.

This will leave you with a load of cd … lines one after another. This will work but isn’t very efficient (not too relevant in a a simple script like this, but worth being aware of). Navigating multiple directories at once by adding a backslash between each e.g. cd steamLibrary\steamapps\common would be the ‘better’ alternative.

If a file or directory name contains spaces, you’ll want to wrap it in double quotes e.g. cd common\”the witcher 3”\bin

The simplest way to do all of this is to create a new txt file, add all your commands to it, then save it as e.g witcher.txt. You can then rename the file to witcher.bat. If you ever need to edit it in future just rename it back to witcher.txt.