Docs: SM64 Guide update to explain how to launch the game with batch files (#768)

* Update setup_en.md

Added several sections in regards to opening the completed SM64 build with batch files instead of SM64PCLauncher.

* Update setup_en.md

* Update setup_en.md

* Update setup_en.md

* Update setup_en.md

* Apply suggestions from code review

Co-authored-by: Yussur Mustafa Oraji <N00byKing@hotmail.de>
Co-authored-by: SoldierofOrder <107806872+SoldierofOrder@users.noreply.github.com>

* Apply more suggestions from code review

matches the original suggestion from SoldierofOrder

---------

Co-authored-by: black-sliver <59490463+black-sliver@users.noreply.github.com>
Co-authored-by: Yussur Mustafa Oraji <N00byKing@hotmail.de>
Co-authored-by: SoldierofOrder <107806872+SoldierofOrder@users.noreply.github.com>

worlds/sm64ex/docs/setup_en.md

@@ -67,6 +67,62 @@ Failing to use a new file may make some locations unavailable. However, this can
 To play offline, first generate a seed on the game's settings page.
 Create a room and download the `.apsm64ex` file, and start the game with the `--sm64ap_file "path/to/FileName"` launch argument.
 
+# Optional: Using Batch Files to play offline and MultiWorld games
+
+As an alternative to launching the game with sm64pclauncher, it is also possible to launch the completed build with the use of Windows batch files. This has the added benefit of streamlining the join process so that manual editing of connection info is not needed for each new game. However, you'll need to be somewhat comfortable with creating and using batch files.
+
+IMPORTANT NOTE: The remainder of this section uses copy-and-paste code that assumes you're using the US version. If you instead use the Japanese version, you'll need to edit the EXE name accordingly by changing "sm64.us.f3dex2e.exe" to "sm64.jp.f3dex2e.exe".
+
+### Making an offline.bat for launching offline patch files
+
+Open Notepad. Paste in the following text: `start sm64.us.f3dex2e.exe --sm64ap_file %1`
+
+Go to File > Save As...
+
+Navigate to the folder you selected for your SM64 build when you followed the Build guide for SM64PCLauncher earlier. Once there, navigate further into `build` and then `us_pc`. This folder should be the same folder that `sm64.us.f3dex2e.exe` resides in. 
+
+Make the file name `"offline.bat"` . THE QUOTE MARKS ARE IMPORTANT! Otherwise, it will create a text file instead ("offline.bat.txt"), which won't work as a batch file.
+
+Now you should have a file called `offline.bat` with a gear icon in the same folder as your "sm64.us.f3dex2e.exe". Right click `offline.bat` and choose `Send To > Desktop (Create Shortcut)`.
+-  If the icon for this file is a notepad rather than a gear, you saved it as a .txt file on accident. To fix this, change the file extension to .bat.
+
+From now on, whenever you start an offline, single-player game, just download the `.apsm64ex` patch file from the Generator, then drag-and-drop that onto `offline.bat` to open the game and start playing.
+
+NOTE: When playing offline patch files, a `.save` file is created in the same directory as your patch file, which contains your save data for that seed. Don't delete it until you're done with that seed.
+
+### Making an online.bat for launching online Multiworld games
+
+These steps are very similar. You will be making a batch file in the same location as before. However, the text you put into this batch file is different, and you will not drag patch files onto it.
+
+Use the same steps as before to open Notepad and paste in the following:
+
+`set /p port="Enter port number of room - "`
+
+`set /p slot="Enter slot name - "`
+
+`start sm64.us.f3dex2e.exe --sm64ap_name "%slot%" --sm64ap_ip archipelago.gg:%port%`
+
+Save this file as `"online.bat"`, then create a shortcut by following the same steps as before. 
+
+To use this batch file,  double-click it. A window will open. Type the five-digit port number of the room you wish to join, then type your slot name.
+- The port number is provided on the room page. The game host should share this page with all players.
+- The slot name is whatever you typed in the "Name" field when creating a config file. All slot names are visible on the room page.
+
+Once you provide those two bits of information, the game will open. If the info is correct, when the game starts, you will see "Connected to Archipelago" on the bottom of your screen, and you will be able to enter the castle.
+- If you don't see this text and crash upon entering the castle, try again. Double-check the port number and slot name; even a single typo will cause your connection to fail.
+
+### Addendum - Deleting old saves
+
+Loading an old Mario save alongside a new seed is a bad idea, as it can cause locked doors and castle secret stars to already be unlocked / obtained. You should avoid opening a save that says "Stars x 0" as opposed to one that simply says "New".
+
+You can manually delete these old saves in-game before starting a new game, but that can be tedious. With a small edit to the batch files, you can delete these old saves automatically. Just add the line `del %AppData%\sm64ex\*.bin` to the batch file, above the `start` command. For example, here is `offline.bat` with the additional line:
+
+`del %AppData%\sm64ex\*.bin`
+
+`start sm64.us.f3dex2e.exe --sm64ap_file %1`
+
+This extra line deletes any previous save data before opening the game. Don't worry about lost stars or checks - the AP server (or in the case of offline, the `.save` file) keeps track of your star count, unlocked keys/caps/cannons, and which locations have already been checked, so you won't have to redo them. At worst you'll have to rewatch the door unlocking animations, and catch the rabbit Mips twice for his first star again if you haven't yet collected the second one.
+
 ## Installation Troubleshooting
 
 Start the game from the command line to view helpful messages regarding SM64EX.