#include <fstream>
#include <iostream>

...
std::ifstream File;
std::string temp;

// Things that I have tried... //
File.open("Playable_Character.txt"); // Open File
File.open("..\\Playable_Character.txt"); // Open File
File.open("User Code\\Playable_Character.txt"); // Open File
File.open("src\\User Code\\Playable_Character.txt"); // Open File
File.open("..\\User Code\\Playable_Character.txt"); // Open File
File.open("..\\src\\User Code\\Playable_Character.txt"); // Open File

if (!File)
{
	DebugMsg::out("whyyyyyyyyyyy");
}
...