-

mpv.net/NativeHelp.cs

@@ -1,4 +1,6 @@
 using System;
+using System.IO;
+using System.Text;
 
 namespace mpvnet
 {
@@ -34,5 +36,25 @@ namespace mpvnet
         {
             Native.AdjustWindowRect(ref rc, (uint)Native.GetWindowLongPtrW(hwnd, -16 /* GWL_STYLE */), false);
         }
+
+        public static string GetAssociatedApplication(string ext)
+        {
+            uint returnValue = 0U;
+            // ASSOCF_VERIFY, ASSOCSTR_EXECUTABLE
+            if (1 == Native.AssocQueryString(0x40, 2, ext, null, null, ref returnValue))
+            {
+                if (returnValue > 0)
+                {
+                    StringBuilder sb = new StringBuilder(Convert.ToInt32(returnValue));
+                    // ASSOCF_VERIFY, ASSOCSTR_EXECUTABLE
+                    if (0 == Native.AssocQueryString(0x40, 2, ext, null, sb, ref returnValue))
+                    {
+                        var ret = sb.ToString();
+                        if (File.Exists(ret)) return ret;
+                    }
+                }
+            }
+            return "";
+        }
     }
 }