diff --git a/Plugins/Flow.Launcher.Plugin.Program/Main.cs b/Plugins/Flow.Launcher.Plugin.Program/Main.cs
index c64cd74ec..9a4e8e5a3 100644
--- a/Plugins/Flow.Launcher.Plugin.Program/Main.cs
+++ b/Plugins/Flow.Launcher.Plugin.Program/Main.cs
@@ -191,11 +191,11 @@ namespace Flow.Launcher.Plugin.Program
                 return;
 
             if (_uwps.Any(x => x.UniqueIdentifier == programToDelete.UniqueIdentifier))
-                _uwps.FirstOrDefault(x => x.UniqueIdentifier == programToDelete.UniqueIdentifier)
+                _uwps.First(x => x.UniqueIdentifier == programToDelete.UniqueIdentifier)
                     .Enabled = false;
 
             if (_win32s.Any(x => x.UniqueIdentifier == programToDelete.UniqueIdentifier))
-                _win32s.FirstOrDefault(x => x.UniqueIdentifier == programToDelete.UniqueIdentifier)
+                _win32s.First(x => x.UniqueIdentifier == programToDelete.UniqueIdentifier)
                     .Enabled = false;
 
             _settings.DisabledProgramSources.Add(new DisabledProgramSource(programToDelete));
diff --git a/Plugins/Flow.Launcher.Plugin.Program/Views/Models/ProgramSource.cs b/Plugins/Flow.Launcher.Plugin.Program/Views/Models/ProgramSource.cs
index a2cdb44f1..45b706a9b 100644
--- a/Plugins/Flow.Launcher.Plugin.Program/Views/Models/ProgramSource.cs
+++ b/Plugins/Flow.Launcher.Plugin.Program/Views/Models/ProgramSource.cs
@@ -19,12 +19,12 @@ namespace Flow.Launcher.Plugin.Program.Views.Models
         public string Location { get; set; }
         public string Name { get => name ?? new DirectoryInfo(Location).Name; set => name = value; }
         public bool Enabled { get; set; } = true;
-        private string uid { get; set; }
 
         /// <summary>
-        /// Guranteed lowercase.
+        /// Guaranteed lowercase.
         /// </summary>
         public string UniqueIdentifier { get => uid; set => uid = value.ToLowerInvariant(); }
+        private string uid { get; set; }
 
         public ProgramSource() { }  // only for json deserialization
 
@@ -74,6 +74,8 @@ namespace Flow.Launcher.Plugin.Program.Views.Models
 
     public class DisabledProgramSource : ProgramSource
     {
+        public new bool Enabled { get; init; }
+
         public DisabledProgramSource() { }  // only for json deserialization
 
         public DisabledProgramSource(string location) : base(location, false) { }
diff --git a/Plugins/Flow.Launcher.Plugin.Program/Views/ProgramSetting.xaml.cs b/Plugins/Flow.Launcher.Plugin.Program/Views/ProgramSetting.xaml.cs
index 364977b71..a1c85087c 100644
--- a/Plugins/Flow.Launcher.Plugin.Program/Views/ProgramSetting.xaml.cs
+++ b/Plugins/Flow.Launcher.Plugin.Program/Views/ProgramSetting.xaml.cs
@@ -199,7 +199,8 @@ namespace Flow.Launcher.Plugin.Program.Views
             {
                 foreach (string directory in directories)
                 {
-                    if (Directory.Exists(directory) && !ProgramSettingDisplayList.Any(x => x.UniqueIdentifier == directory.ToLowerInvariant()))
+                    if (Directory.Exists(directory)
+                        && !ProgramSettingDisplayList.Any(x => x.UniqueIdentifier.Equals(directory, System.StringComparison.InvariantCultureIgnoreCase)))
                     {
                         var source = new ProgramSource(directory);