I'm trying to make a song pack for personal use, and I honestly have no idea where to even begin. I have my songs, I put them in "songs" and I run the start.bat, cmd opens then closes, and then nothing happens. What's going wrong?

Hello, do you have by any chance special characters in your path to the directory containing extension creator? Please try moving extension creator's directory to a different location and check if it solves the issue. Also make sure that "node.exe" is located in the extension creator's directory, it's required to run the tool. If "node.exe" is not located there, please extract the tool again from it's zip archive that you downloaded. If the issue persists you can try do the following:
1. Extract extension creator directory to some easily accessible location. such as C: drive.
Tool's path should look like this: C:\Pocket_Music_Player_Extension_Creator
2. Next start cmd by typing "cmd" to your windows search bar and choosing "Command Prompt".
3. Type following commands into cmd, press "enter" key after each command:
3.1 "C:"
3.2 "cd C:\Pocket_Music_Player_Extension_Creator"
3.3 "node.exe main.js"
3.4 After typing in these commands you should see tool's welcome message after a couple of seconds.
If you get an error message please post it here.

The error message I get is this

Error: Cannot find module 'prompt'
at Function.Module._resolveFilename (module.js:547:15)
at Function.Module._load (module.js:474:25)
at Module.require (module.js:596:17)
at require (internal/module.js:11:18)
at Object.<anonymous> (C:\Users\REDACTED\Pocket Music Player Extension Creator\main.js:2:16)
at Module._compile (module.js:652:30)
at Object.Module._extensions..js (module.js:663:10)
at Module.load (module.js:565:32)
at tryModuleLoad (module.js:505:12)
at Function.Module._load (module.js:497:3)

With the following above it

module.js:549
throw err;
^

Hmm, that's interesting, the tool is not detecting one of it's required libraries even though it's packaged with it. Does your extension creator directory contain a folder called "node_modules"? If not please extract the tool again from it's zip archive.

Node libraries is not in the file. I'll go redownload it

It isn't in the github.

It is. I was looking at a different file. Going to retry, now

New issue (?) after making the mod, it "converted" all the songs into an .ogg, but none of the songs are in the mod's song folder, and it also spit out an error code.

events.js:183
throw er; // Unhandled 'error' event
^

Error: spawn ./data/ffmpeg.exe ENOENT
at _errnoException (util.js:992:11)
at Process.ChildProcess._handle.onexit (internal/child_process.js:190:19)
at onErrorNT (internal/child_process.js:372:16)
at _combinedTickCallback (internal/process/next_tick.js:138:11)
at process._tickDomainCallback (internal/process/next_tick.js:218:9)

Just to clarify, you downloaded file named "Pocket_Music_Player_Extension_Creator.zip" from github right? If yes then try removing special characters from names of your songs, tool works with underscores, spaces, numbers and letters though it's best to keep song names simple, for example: MySong1.mp3 . Also don't use special characters in name of your extension.

I'll see what I can do

I got the file from the correct place, I renamed all the songs, removed all the spaces and everything that wasn't a letter or number, and it still gives me this error.

events.js:183
throw er; // Unhandled 'error' event
^

Error: spawn ./data/ffmpeg.exe ENOENT
at _errnoException (util.js:992:11)
at Process.ChildProcess._handle.onexit (internal/child_process.js:190:19)
at onErrorNT (internal/child_process.js:372:16)
at _combinedTickCallback (internal/process/next_tick.js:138:11)
at process._tickDomainCallback (internal/process/next_tick.js:218:9)

Could you please check if your extension creator directory contains a folder called "data"? Inside of it should be located a file with name "ffmpeg.exe". The error states that this file does not exist.

You'd be correct. That file doesn't exist.