Use ShellExecute instead of AppInfo to open files on Windows

libdino/src/service/util.vala

@@ -3,6 +3,15 @@ using Dino.Entities;
 namespace Dino {
 
 public class Util {
+    #if _WIN32
+    [CCode (cname = "ShellExecuteA")]
+    private static extern int ShellExecuteA(int* hwnd, string operation, string file, string parameters, string directory, int showCmd);
+
+    private static int ShellExecute(string file) {
+        return ShellExecuteA(null, null, file, null, null, 0);
+    }
+    #endif
+
     public static Message.Type get_message_type_for_conversation(Conversation conversation) {
         switch (conversation.type_) {
             case Conversation.Type.CHAT:
@@ -27,6 +36,15 @@ public class Util {
         assert_not_reached();
     }
 
+    public static void launch_default_for_uri(string file_uri)
+    {
+#if _WIN32
+        Dino.Util.ShellExecute(file_uri);
+#else
+        AppInfo.launch_default_for_uri(file_uri, null);
+#endif
+    }
+    
     public static string get_content_type(FileInfo fileInfo)
     {
 #if _WIN32

main/src/ui/conversation_content_view/file_widget.vala

@@ -165,7 +165,7 @@ public class FileDefaultWidgetController : Object {
             case FileTransfer.State.COMPLETE:
                 if (event_button.button == 1) {
                     try{
-                        AppInfo.launch_default_for_uri(file_uri, null);
+                        Dino.Util.launch_default_for_uri(file_uri);
                     } catch (Error err) {
                         warning("Failed to open %s - %s", file_uri, err.message);
                     }

main/src/ui/manage_accounts/add_account_dialog.vala

@@ -368,7 +368,7 @@ public class AddAccountDialog : Gtk.Dialog {
         // Button is opening a registration website
         if (form.oob != null) {
             try {
-                AppInfo.launch_default_for_uri(form.oob, null);
+                Dino.Util.launch_default_for_uri(form.oob);
             } catch (Error e) { }
             show_sign_in_jid();
             return;