diff --git a/APKToolGUI/ApkTool/AaptParser.cs b/APKToolGUI/ApkTool/AaptParser.cs
index eb286af..786e27b 100644
--- a/APKToolGUI/ApkTool/AaptParser.cs
+++ b/APKToolGUI/ApkTool/AaptParser.cs
@@ -108,26 +108,26 @@ namespace APKToolGUI.Utils
                     switch (line.Split(':')[0])
                     {
                         case "package":
-                            PackageName = StringExt.Regex(@"(?<=package: name=\')(.*?)(?=\')", line);
-                            VersionName = StringExt.Regex(@"(?<=versionName=\')(.*?)(?=\')", line);
-                            VersionCode = StringExt.Regex(@"(?<=versionCode=\')(.*?)(?=\')", line);
+                            PackageName = StringExt.RegexExtract(@"(?<=package: name=\')(.*?)(?=\')", line);
+                            VersionName = StringExt.RegexExtract(@"(?<=versionName=\')(.*?)(?=\')", line);
+                            VersionCode = StringExt.RegexExtract(@"(?<=versionCode=\')(.*?)(?=\')", line);
                             break;
                         case "uses-permission":
-                            permissionsBuilder.AppendLine(StringExt.Regex(@"(?<=name=\')(.*?)(?=\')", line));
+                            permissionsBuilder.AppendLine(StringExt.RegexExtract(@"(?<=name=\')(.*?)(?=\')", line));
                             break;
                         case "sdkVersion":
-                            MinSdkVersionDetailed = SdkToAndroidVer(StringExt.Regex(@"(?<=sdkVersion:\')(.*?)(?=\')", line));
-                            MinSdkVersion = StringExt.Regex(@"(?<=sdkVersion:\')(.*?)(?=\')", line);
+                            MinSdkVersionDetailed = SdkToAndroidVer(StringExt.RegexExtract(@"(?<=sdkVersion:\')(.*?)(?=\')", line));
+                            MinSdkVersion = StringExt.RegexExtract(@"(?<=sdkVersion:\')(.*?)(?=\')", line);
                             break;
                         case "targetSdkVersion":
-                            TargetSdkVersionDetailed = SdkToAndroidVer(StringExt.Regex(@"(?<=targetSdkVersion:\')(.*?)(?=\')", line));
-                            TargetSdkVersion = StringExt.Regex(@"(?<=targetSdkVersion:\')(.*?)(?=\')", line);
+                            TargetSdkVersionDetailed = SdkToAndroidVer(StringExt.RegexExtract(@"(?<=targetSdkVersion:\')(.*?)(?=\')", line));
+                            TargetSdkVersion = StringExt.RegexExtract(@"(?<=targetSdkVersion:\')(.*?)(?=\')", line);
                             break;
                         case "application-label":
-                            AppName = StringExt.Regex(@"(?<=application-label:\')(.*?)(?=\')", line);
+                            AppName = StringExt.RegexExtract(@"(?<=application-label:\')(.*?)(?=\')", line);
                             break;
                         case "launchable-activity":
-                            LaunchableActivity = StringExt.Regex(@"(?<=name=\')(.*?)(?=\')", line);
+                            LaunchableActivity = StringExt.RegexExtract(@"(?<=name=\')(.*?)(?=\')", line);
                             break;
                         case "supports-screens":
                             var screens = Regex.Matches(line.Split(':')[1], @"(?<= \')(.*?)(?=\')").Cast<Match>().Select(m => m.Value).ToList();
@@ -161,13 +161,13 @@ namespace APKToolGUI.Utils
                 ApkMirrorLink = "https://www.apkmirror.com/?post_type=app_release&searchtype=apk&s=" + PackageName;
                 ApkGkLink = "https://apkgk.com/" + PackageName + "/download";
 
-                AppIcon120 = StringExt.Regex(@"(?<=application-icon-120:\')(.*?)(?=\')", FullInfo);
-                AppIcon160 = StringExt.Regex(@"(?<=application-icon-160:\')(.*?)(?=\')", FullInfo);
-                AppIcon240 = StringExt.Regex(@"(?<=application-icon-240:\')(.*?)(?=\')", FullInfo);
-                AppIcon320 = StringExt.Regex(@"(?<=application-icon-320:\')(.*?)(?=\')", FullInfo);
-                AppIcon480 = StringExt.Regex(@"(?<=application-icon-480:\')(.*?)(?=\')", FullInfo);
-                AppIcon640 = StringExt.Regex(@"(?<=application-icon-640:\')(.*?)(?=\')", FullInfo);
-                AppIcon65534 = StringExt.Regex(@"(?<=application-icon-65534:\')(.*?)(?=\')", FullInfo);
+                AppIcon120 = StringExt.RegexExtract(@"(?<=application-icon-120:\')(.*?)(?=\')", FullInfo);
+                AppIcon160 = StringExt.RegexExtract(@"(?<=application-icon-160:\')(.*?)(?=\')", FullInfo);
+                AppIcon240 = StringExt.RegexExtract(@"(?<=application-icon-240:\')(.*?)(?=\')", FullInfo);
+                AppIcon320 = StringExt.RegexExtract(@"(?<=application-icon-320:\')(.*?)(?=\')", FullInfo);
+                AppIcon480 = StringExt.RegexExtract(@"(?<=application-icon-480:\')(.*?)(?=\')", FullInfo);
+                AppIcon640 = StringExt.RegexExtract(@"(?<=application-icon-640:\')(.*?)(?=\')", FullInfo);
+                AppIcon65534 = StringExt.RegexExtract(@"(?<=application-icon-65534:\')(.*?)(?=\')", FullInfo);
 
                 result = true;
             }
@@ -256,7 +256,7 @@ namespace APKToolGUI.Utils
                     //File.WriteAllText("R:\\t.txt", ps);
                     string icondl = Path.Combine(cacheDir, "icon.png");
                     Directory.CreateDirectory(cacheDir);
-                    w.DownloadFile(StringExt.Regex(@"(?<=\""image\"":\"")(.*?)(?=\"",\"")", ps), icondl);
+                    w.DownloadFile(StringExt.RegexExtract(@"(?<=\""image\"":\"")(.*?)(?=\"",\"")", ps), icondl);
                     iconLocation = icondl;
                 }
                 catch (System.Net.WebException ex)
diff --git a/APKToolGUI/Forms/FormMain.cs b/APKToolGUI/Forms/FormMain.cs
index 964880f..c445afd 100644
--- a/APKToolGUI/Forms/FormMain.cs
+++ b/APKToolGUI/Forms/FormMain.cs
@@ -59,6 +59,8 @@ namespace APKToolGUI
             Text += " - v" + ProductVersion;
             Application.ApplicationExit += new EventHandler(Application_ApplicationExit);
 
+            aapt = new AaptParser();
+
             if (!File.Exists(Settings.Default.Decode_InputAppPath))
                 Settings.Default.Decode_InputAppPath = "";
             if (!Directory.Exists(Settings.Default.Build_InputDir))
@@ -203,7 +205,7 @@ namespace APKToolGUI
                 ToLog(ApktoolEventType.Success, Language.Done);
                 ToStatus(Language.Done, Resources.done);
             }
-            catch (Exception)
+            catch (Exception ex)
             {
 #if DEBUG
                 ToLog(ApktoolEventType.Warning, Language.ErrorGettingApkInfo + "\n" + ex.ToString());
@@ -419,6 +421,7 @@ namespace APKToolGUI
                         color = Color.DarkOrange;
                     else
                         color = Color.Orange;
+                        color = Color.White;
                     break;
                 case ApktoolEventType.Unknown:
                     if (Program.IsDarkTheme())
diff --git a/APKToolGUI/Forms/FormSettings.cs b/APKToolGUI/Forms/FormSettings.cs
index b5b494a..9aeaff4 100644
--- a/APKToolGUI/Forms/FormSettings.cs
+++ b/APKToolGUI/Forms/FormSettings.cs
@@ -139,7 +139,7 @@ namespace APKToolGUI
                 if (Language.SystemLanguage.Equals(comboBox1.SelectedItem.ToString()))
                     Settings.Default.Culture = "Auto";
                 else
-                    Settings.Default.Culture = StringExt.Regex(@"(?<=\[)(.*?)(?=\])", comboBox1.SelectedItem.ToString());
+                    Settings.Default.Culture = StringExt.RegexExtract(@"(?<=\[)(.*?)(?=\])", comboBox1.SelectedItem.ToString());
 
                 Settings.Default.Theme = themeComboBox.SelectedIndex;
                 Settings.Default.Save();
diff --git a/APKToolGUI/Program.cs b/APKToolGUI/Program.cs
index 178820a..e0c2023 100644
--- a/APKToolGUI/Program.cs
+++ b/APKToolGUI/Program.cs
@@ -10,6 +10,7 @@ using System.Diagnostics;
 using System.IO;
 using System.Reflection;
 using System.Runtime.InteropServices;
+using System.Text;
 using System.Windows.Forms;
 
 namespace APKToolGUI
@@ -165,12 +166,13 @@ namespace APKToolGUI
             List<String> missigFiles = MissingFilesCheck();
             if (missigFiles.Count > 0)
             {
-                String files = Environment.NewLine;
+                StringBuilder filesBuilder = new StringBuilder();
+                filesBuilder.AppendLine();
                 foreach (String file in missigFiles)
                 {
-                    files += file + Environment.NewLine;
+                    filesBuilder.AppendLine(file);
                 }
-                MessageBox.Show(Language.RequiredFilesMissing + files, Application.ProductName, MessageBoxButtons.OK, MessageBoxIcon.Error);
+                MessageBox.Show(Language.RequiredFilesMissing + filesBuilder.ToString(), Application.ProductName, MessageBoxButtons.OK, MessageBoxIcon.Error);
                 //Application.Exit();
                 return false;
             }
diff --git a/APKToolGUI/Utils/CommonUtils.cs b/APKToolGUI/Utils/CommonUtils.cs
index d1904d2..fb18eab 100644
--- a/APKToolGUI/Utils/CommonUtils.cs
+++ b/APKToolGUI/Utils/CommonUtils.cs
@@ -17,7 +17,7 @@ namespace APKToolGUI.Utils
             {
                 if (mf.Contains("<application"))
                 {
-                    return StringExt.Regex(@"(?<=android:name=\"")(.*?)(?=\"")", mf);
+                    return StringExt.RegexExtract(@"(?<=android:name=\"")(.*?)(?=\"")", mf);
                 }
             }
             return "";
@@ -31,11 +31,11 @@ namespace APKToolGUI.Utils
             foreach (string mf in Manifest)
             {
                 if (String.IsNullOrEmpty(packageName))
-                    packageName = StringExt.Regex(@"(?<=package=\"")(.*?)(?=\"")", mf);
+                    packageName = StringExt.RegexExtract(@"(?<=package=\"")(.*?)(?=\"")", mf);
 
                 if (mf.Contains("<activity"))
                 {
-                    mainActivity = StringExt.Regex(@"(?<=android:name=\"")(.*?)(?=\"")", mf);
+                    mainActivity = StringExt.RegexExtract(@"(?<=android:name=\"")(.*?)(?=\"")", mf);
                 }
                 if (mf.Contains("android.intent.action.MAIN"))
                 {
diff --git a/APKToolGUI/Utils/StringExt.cs b/APKToolGUI/Utils/StringExt.cs
index c5d1800..18fccfa 100644
--- a/APKToolGUI/Utils/StringExt.cs
+++ b/APKToolGUI/Utils/StringExt.cs
@@ -5,18 +5,36 @@ using System.IO;
 using System.Linq;
 using System.Text;
 using System.Text.RegularExpressions;
+using System.Threading;
 using System.Threading.Tasks;
 
 namespace APKToolGUI.Utils
 {
     public static class StringExt
     {
-        static readonly Random random = new Random();
-
-        public static string Regex(string text, string match)
+        [ThreadStatic]
+        private static Random threadRandom;
+        
+        private static Random ThreadRandom
         {
-            Regex myRegex = new Regex(text);
-            Match matched = myRegex.Match(match);
+            get
+            {
+                if (threadRandom == null)
+                    threadRandom = new Random(unchecked(Environment.TickCount * 31 + Thread.CurrentThread.ManagedThreadId));
+                return threadRandom;
+            }
+        }
+
+        /// <summary>
+        /// Extracts a string from the input using the provided regex pattern.
+        /// </summary>
+        /// <param name="pattern">The regex pattern to match.</param>
+        /// <param name="input">The input string to search.</param>
+        /// <returns>The matched string or empty string if no match found.</returns>
+        public static string RegexExtract(string pattern, string input)
+        {
+            Regex regex = new Regex(pattern);
+            Match matched = regex.Match(input);
             return matched.ToString();
         }
 
@@ -24,14 +42,14 @@ namespace APKToolGUI.Utils
         {
             const string chars = "abcdefghijklmnopqrstuvwxyz";
             return new string(Enumerable.Repeat(chars, length)
-              .Select(s => s[random.Next(s.Length)]).ToArray());
+              .Select(s => s[ThreadRandom.Next(s.Length)]).ToArray());
         }
 
         public static string RandStrWithCaps(int length)
         {
             const string chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
             return new string(Enumerable.Repeat(chars, length)
-              .Select(s => s[random.Next(s.Length)]).ToArray());
+              .Select(s => s[ThreadRandom.Next(s.Length)]).ToArray());
         }
 
         /// <summary>