diff --git a/README.md b/README.md
index b3333da..9dbf1fa 100644
--- a/README.md
+++ b/README.md
@@ -3,3 +3,8 @@
 A Plutonium launcher that aims to make old CoD games more accessible
 -----
 Currently being written from scratch, please be patient.
+
+## To do
+- Make each HTTPS request its own function instead of binding them to an event
+- De-duplicate code (HTTPS requests in src/main.js for example)
+- Make a better UI/UX
diff --git a/src/main.js b/src/main.js
index 9173146..2ac2e81 100644
--- a/src/main.js
+++ b/src/main.js
@@ -1,5 +1,6 @@
 const path = require("node:path");
 const fs = require("node:fs");
+const fsPromises = require("node:fs/promises");
 const https = require("node:https");
 const process = require("node:process");
 const os = require("node:os");
@@ -43,6 +44,15 @@ let userInfo = {
 	"emailVerified": false,
 	"avatar": "https://forum.plutonium.pw/assets/uploads/system/avatar-default.png"
 };
+let config = {
+	"user-info": userInfo,
+	"game-directories": {
+		"iw5": "",
+		"t4": "",
+		"t5": "",
+		"t6": ""
+	}
+};
 
 function createMainWindow() {
 	mainWindow = new electron.BrowserWindow({
@@ -65,6 +75,34 @@ function createMainWindow() {
 	});
 }
 
+function readConfig(filePath) {
+	return new Promise(function (resolve, reject) {
+		if (!fs.existsSync(filePath) || !fs.statSync(filePath).isFile()) return reject(new Error("Config file doesn't exist or is not a file."));
+
+		fsPromises.readFile(filePath, "utf-8").then(function (contents) {
+			try {
+				let data = JSON.parse(contents);
+
+				resolve(data);
+			} catch (error) {
+				reject(error);
+			}
+		}).catch(function (error) {
+			reject(error);
+		});
+	});
+}
+
+function writeConfig(filePath, data = {}) {
+	return new Promise(function (resolve, reject) {
+		fsPromises.writeFile(filePath, JSON.stringify(data, null, "\t")).then(function () {
+			resolve();
+		}).catch(function (error) {
+			reject(error);
+		});
+	});
+}
+
 function fetchPlutoniumManifest() {
 	return new Promise(function (resolve, reject) {
 		let request = https.request("https://cdn.plutonium.pw/updater/prod/info.json", {
@@ -99,6 +137,62 @@ function fetchPlutoniumManifest() {
 	});
 }
 
+function validatePlutoniumLogin(token) {
+	return new Promise(function (resolve, reject) {
+		let request = https.request("https://nix.plutonium.pw/api/auth/validate", {
+			"method": "GET",
+			"headers": {
+				"Content-Length": 0,
+				"Authorization": "UserToken " + token,
+				"X-Plutonium-Revision": String(plutoniumManifest.revision),
+				"User-Agent": "Nix/3.0"
+			}
+		}, function (response) {
+			if (response.statusCode !== 200) {
+				return resolve({
+					"status": "unauthenticated",
+					"successful": false
+				});
+			}
+
+			response.setEncoding("utf-8");
+
+			let body = "";
+			response.on("data", function (chunk) {
+				body += chunk;
+			});
+			response.on("end", function () {
+				try {
+					let data = JSON.parse(body);
+
+					if (!("userId" in data)) {
+						reject(new Error("Authentication seems to be successful but no user identifier was returned."));
+					}
+
+					resolve({
+						"status": "authenticated",
+						"successful": true,
+						...data
+					});
+
+					userInfo = {
+						"token": token,
+						...data
+					};
+				} catch (error) {
+					reject(error);
+				}
+			});
+		});
+
+		request.on("error", function (error) {
+			reject(error);
+		});
+
+		request.end();
+	});
+}
+
 function getPlutoniumSession(game, token) {
 	return new Promise(function (resolve, reject) {
 		let payload = JSON.stringify({
@@ -180,6 +274,7 @@ function launch(plutoniumInstallDirectory, game, gameInstallDirectory, online) {
 			}
 
 			let gameProcess = child_process.spawn(bootstrapperBinary, bootstrapperArguments, {
+				"cwd": plutoniumInstallDirectory,
 				"detached": true,
 				"stdio": "ignore"
 			});
@@ -201,6 +296,33 @@ electron.app.once("ready", function () {
 	}).catch(function (error) {
 		electron.dialog.showErrorBox("Error", "The Plutonium launcher manifest could not be fetched, auto-updating might not be possible.\n" + error.message);
 	});
+
+	if (fs.existsSync(configFilePath)) {
+		readConfig(configFilePath).then(function (data) {
+			config = data;
+
+			if (config["user-info"].token === "V3ryS3cr3t4uth3nt1c4t10nT0k3n") {
+				return;
+			} else {
+				validatePlutoniumLogin(config["user-info"].token).then(function (data) {
+					if (!data.successful) {
+						config["user-info"].token = "V3ryS3cr3t4uth3nt1c4t10nT0k3n";
+						return writeConfig(configFilePath, config).catch(function (error) {
+							console.error(error);
+						});
+					}
+
+					mainWindow.loadFile(path.join(__dirname, "src", "views", "games.html"));
+				});
+			}
+		}).catch(function (error) {
+			electron.dialog.showErrorBox("Error", "Configuration file could not be read.\n" + error.message);
+		});
+	} else {
+		writeConfig(configFilePath, config).catch(function (error) {
+			electron.dialog.showErrorBox("Error", "Configuration file doesn't exist and could not be created.\n" + error.message);
+		});
+	}
 });
 
 electron.app.on("window-all-closed", function () {
@@ -252,6 +374,10 @@ electron.ipcMain.handle("login", function (event, username, password) {
 					});
 
 					userInfo = data;
+					config["user-info"] = userInfo;
+					writeConfig(configFilePath, config).catch(function (error) {
+						console.error(error);
+					});
 
 					mainWindow.loadFile(path.join(__dirname, "src", "views", "games.html"));
 				} catch (error) {