diff --git a/entry.js b/entry.js
index 425f615..60e2567 100644
--- a/entry.js
+++ b/entry.js
@@ -5,14 +5,15 @@ const {
     Notification,
     shell,
     nativeImage,
-    nativeTheme
+    nativeTheme,
+    dialog
 } = require('electron');
 
 const path = require('path');
 
 require('electron-store').initRenderer();
 
-let mainWindow, analyticsWindow;
+let mainWindow, analyticsWindow, settingsWindow;
 
 ipcMain.handle('hide-window', () => mainWindow.hide());
 ipcMain.handle('show-window', () => mainWindow.show());
@@ -26,7 +27,7 @@ ipcMain.on('notification', (event, args) => {
 ipcMain.on('is-window-dark', (e) => e.returnValue = nativeTheme.shouldUseDarkColors);
 
 ipcMain.handle('open-settings', () => {
-    const settingsWindow = new BrowserWindow ({
+    settingsWindow = new BrowserWindow ({
         width: 900,
         height: 600,
         webPreferences: {
@@ -120,6 +121,16 @@ app.whenReady().then(() => {
         mainWindow.webContents.send('change-voicepack');
     });
 
+    ipcMain.on('prefix-con', async () => {
+        const result = await dialog.showOpenDialog({ properties: ['openDirectory'] });
+        if(result.filePaths.length == 0) return;
+        mainWindow.webContents.send('change-prefix', { 'dir': result.filePaths[0] });
+    });
+
+    ipcMain.on('prefix-changed', async () => {
+        settingsWindow.webContents.send('prefix-changed');
+    });
+
     ipcMain.on('rpc-toggle', () => mainWindow.webContents.send('rpc-toggle'));
 });
 
diff --git a/public/html/settings.html b/public/html/settings.html
index 91bac00..1fb5e96 100644
--- a/public/html/settings.html
+++ b/public/html/settings.html
@@ -112,6 +112,12 @@
                         </ul>
                     </div>
 
+                <div id="prefixloc">
+                    <span id="setprefix">empty</span>
+                    
+                    <button class="button" id="prefixdir" i18id="ChangePrefix">Change Prefix</button>
+                </div>
+
                     <div class="selected-item">
                         <span>System</span>
 
diff --git a/src/ts/index.ts b/src/ts/index.ts
index 0f0909c..fdf0309 100644
--- a/src/ts/index.ts
+++ b/src/ts/index.ts
@@ -13,12 +13,13 @@ import LauncherLib from './lib/LauncherLib';
 import LauncherUI from './lib/LauncherUI';
 import Tools from './lib/Tools';
 import DiscordRPC from './lib/DiscordRPC';
+import PrefixSelector from './lib/PrefixSelector';
 import SwitcherooControl from './lib/SwitcherooControl';
 
 const launcher_version = require('../../package.json').version;
 
-if (!fs.existsSync(constants.prefixDir))
-    fs.mkdirSync(constants.prefixDir, { recursive: true });
+if (!fs.existsSync(LauncherLib.getConfig('prefix')))
+    fs.mkdirSync(LauncherLib.getConfig('prefix'), { recursive: true });
 
 if (!fs.existsSync(constants.runnersDir))
     fs.mkdirSync(constants.runnersDir, { recursive: true });
@@ -59,6 +60,12 @@ $(() => {
         LauncherUI.updateLauncherState();
     });
 
+    ipcRenderer.on('change-prefix', (event: void, data: any) => {
+        PrefixSelector.set(data.dir);
+        LauncherUI.updateLauncherState();
+        ipcRenderer.send('prefix-changed');
+    });
+
     Tools.getGitTags(constants.uri.launcher).then(tags => {
         const latestVersion = tags[tags.length - 1].tag;
 
diff --git a/src/ts/lib/LauncherLib.ts b/src/ts/lib/LauncherLib.ts
index 46db0b3..4ec68e0 100644
--- a/src/ts/lib/LauncherLib.ts
+++ b/src/ts/lib/LauncherLib.ts
@@ -27,6 +27,7 @@ const config = new store ({
             file: null
         },
         version: null, // Installed game version
+        prefix: path.join(os.homedir(), '.local', 'share', 'anime-game-launcher', 'game'), // Default Prefix
         patch: null, // Installed patch info ({ version, state } - related game's version and patch's state)
         runner: null, // Selected runner ({ folder, executable })
         rpc: false, // Discord RPC
diff --git a/src/ts/lib/PrefixSelector.ts b/src/ts/lib/PrefixSelector.ts
new file mode 100644
index 0000000..16a214e
--- /dev/null
+++ b/src/ts/lib/PrefixSelector.ts
@@ -0,0 +1,55 @@
+const fs = require('fs');
+import LauncherLib from "./LauncherLib";
+const path = require('path');
+const os = require('os');
+
+export default class PrefixSelector
+{
+    protected static prefix: string = LauncherLib.getConfig('prefix');
+
+    public static set(location: string) {
+        if (this.prefix == location) return console.log('Can\'t set already selected prefix as new prefix');
+
+        if (fs.existsSync(path.join(location, 'drive_c', 'Program Files', 'Genshin Impact', 'GenshinImpact_Data', 'Persistent'))) {
+            const version = fs.readFileSync(path.join(location, 'drive_c', 'Program Files', 'Genshin Impact', 'GenshinImpact_Data', 'Persistent', 'ScriptVersion'), { encoding: 'UTF-8' }).toString();
+
+            LauncherLib.updateConfig('version', version);
+            LauncherLib.updateConfig('prefix', location);
+            this.prefix = location;
+        } else if (fs.existsSync(path.join(location, 'drive_c', 'Program Files', 'Genshin Impact', 'GenshinImpact_Data', 'globalgamemanagers'))) {
+            const config = fs.readFileSync(path.join(location, 'drive_c', 'Program Files', 'Genshin Impact', 'GenshinImpact_Data', 'globalgamemanagers'), { encoding: 'ascii' });
+            const version = /([1-9]+\.[0-9]+\.[0-9]+)_[\d]+_[\d]+/.exec(config)![1];
+            console.log(version);
+            LauncherLib.updateConfig('prefix', location);
+            this.prefix = location;
+        } else {
+            console.log('Game not found.');
+
+            // Unset version if game is not found.
+            LauncherLib.updateConfig('version', null);
+            LauncherLib.updateConfig('prefix', location);
+            this.prefix = location;
+        }
+    }
+
+    public static Default() {
+        const dp = path.join(os.homedir(), '.local', 'share', 'anime-game-launcher', 'game');
+
+        if (this.prefix == dp) return console.log('Can\'t set already selected prefix as new prefix');
+
+        if (fs.existsSync(path.join(dp, 'drive_c', 'Program Files', 'Genshin Impact', 'GenshinImpact_Data', 'Persistent'))) {
+            const version = fs.readFileSync(path.join(dp, 'drive_c', 'Program Files', 'Genshin Impact', 'GenshinImpact_Data', 'Persistent', 'ScriptVersion'), { encoding: 'UTF-8' }).toString();
+            console.log(version);
+        } else if (fs.existsSync(path.join(dp, 'drive_c', 'Program Files', 'Genshin Impact', 'GenshinImpact_Data', 'globalgamemanagers'))) {
+            const config = fs.readFileSync(path.join(dp, 'drive_c', 'Program Files', 'Genshin Impact', 'GenshinImpact_Data', 'globalgamemanagers'), { encoding: 'ascii' });
+            const version = /([1-9]+\.[0-9]+\.[0-9]+)_[\d]+_[\d]+/.exec(config)![1];
+            console.log(version);
+        } else {
+            console.log('Game not found.');
+
+            // Unset version if game is not found.
+            LauncherLib.updateConfig('version', null);
+        }
+    }
+
+}
\ No newline at end of file
diff --git a/src/ts/settings.ts b/src/ts/settings.ts
index 71104af..3328ded 100644
--- a/src/ts/settings.ts
+++ b/src/ts/settings.ts
@@ -54,6 +54,20 @@ $(() => {
         }
     });
 
+    /**
+     * Prefix
+     */
+
+    $('#prefixloc span').text(LauncherLib.getConfig('prefix'));
+    
+    ipcRenderer.on('prefix-changed', () => {
+        $('#prefixloc span').text(LauncherLib.getConfig('prefix'));
+    })
+
+    $('#prefixloc #prefixdir').on('click', () => {
+        ipcRenderer.send('prefix-con');
+    })
+
     /**
      * Game voice language
      */