Fix crash when opening urls with non-existent local file

Flow.Launcher/Languages/en.xaml

@@ -22,7 +22,7 @@
     <system:String x:Key="restartToDisablePortableMode">Flow Launcher needs to restart to finish disabling portable mode, after the restart your portable data profile will be deleted and roaming data profile kept</system:String>
     <system:String x:Key="restartToEnablePortableMode">Flow Launcher needs to restart to finish enabling portable mode, after the restart your roaming data profile will be deleted and portable data profile kept</system:String>
     <system:String x:Key="moveToDifferentLocation">Flow Launcher has detected you enabled portable mode, would you like to move it to a different location?</system:String>
     <system:String x:Key="shortcutsUninstallerCreated">Flow Launcher has detected you disabled portable mode, the relevant shortcuts and uninstaller entry have been created</system:String>
     <system:String x:Key="userDataDuplicated">Flow Launcher detected your user data exists both in {0} and {1}. {2}{2}Please delete {1} in order to proceed. No changes have occurred.</system:String>
 
     <!--  Plugin Loader  -->
@@ -590,6 +590,7 @@
     <system:String x:Key="errorTitle">Error</system:String>
     <system:String x:Key="folderOpenError">An error occurred while opening the folder. {0}</system:String>
     <system:String x:Key="browserOpenError">An error occurred while opening the URL in the browser. Please check your Default Web Browser configuration in the General section of the settings window</system:String>
+    <system:String x:Key="fileNotFoundError">File or directory not found: {0}</system:String>
 
     <!--  General Notice  -->
     <system:String x:Key="pleaseWait">Please wait...</system:String>

Flow.Launcher/PublicAPIInstance.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Concurrent;
 using System.Collections.Generic;
 using System.Collections.Specialized;
@@ -412,6 +412,12 @@ public void OpenDirectory(string directoryPath, string fileNameOrFilePath = null
 
         private void OpenUri(Uri uri, bool? inPrivate = null, bool forceBrowser = false)
         {
+            if (uri.IsFile && !File.Exists(uri.LocalPath) && !Directory.Exists(uri.LocalPath))
+            {
+                ShowMsgError(GetTranslation("errorTitle"), string.Format(GetTranslation("fileNotFoundError"), uri.LocalPath));
+                return;
+            }
+
             if (forceBrowser || uri.Scheme == Uri.UriSchemeHttp || uri.Scheme == Uri.UriSchemeHttps)
             {
                 var browserInfo = _settings.CustomBrowser;
@@ -441,13 +447,19 @@ private void OpenUri(Uri uri, bool? inPrivate = null, bool forceBrowser = false)
             }
             else
             {
-                Process.Start(new ProcessStartInfo()
+                try
                 {
-                    FileName = uri.AbsoluteUri,
-                    UseShellExecute = true
-                })?.Dispose();
-
-                return;
+                    Process.Start(new ProcessStartInfo()
+                    {
+                        FileName = uri.AbsoluteUri,
+                        UseShellExecute = true
+                    })?.Dispose();
+                }
+                catch (Exception e)
+                {
+                    LogException(ClassName, $"Failed to open: {uri.AbsoluteUri}", e);
+                    ShowMsgError(GetTranslation("errorTitle"), e.Message);
+                }
             }
         }