diff --git a/NAPS2.App.Mac/Info.plist b/NAPS2.App.Mac/Info.plist
index 4feecdee2..00796f969 100644
--- a/NAPS2.App.Mac/Info.plist
+++ b/NAPS2.App.Mac/Info.plist
@@ -2,6 +2,8 @@
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
   <dict>
+
+    <!-- Basic metadata -->
     <key>CFBundleName</key>
     <string>NAPS2</string>
     <key>CFBundleIdentifier</key>
@@ -17,10 +19,77 @@
     <key>CFBundleIconFile</key>
     <string>Icon.icns</string>
     <key>NSPrincipalClass</key>
+
     <!-- We start as a background application in case we're in worker mode and don't want to show a UI.
      If we're in GUI mode we dynamically switch to a foreground application (see MacEntryPoint.cs). -->
     <string>NSApplication</string>
     <key>LSBackgroundOnly</key>
     <true/>
+
+    <!-- File types for "Open With" -->
+    <key>CFBundleDocumentTypes</key>
+    <array>
+      <dict>
+        <key>CFBundleTypeRole</key>
+        <string>Editor</string>
+        <key>CFBundleTypeName</key>
+        <string>PDF</string>
+        <key>LSItemContentTypes</key>
+        <array>
+          <string>com.adobe.pdf</string>
+        </array>
+      </dict>
+      <dict>
+        <key>CFBundleTypeRole</key>
+        <string>Editor</string>
+        <key>CFBundleTypeName</key>
+        <string>JPG</string>
+        <key>LSItemContentTypes</key>
+        <array>
+          <string>public.jpeg</string>
+        </array>
+      </dict>
+      <dict>
+        <key>CFBundleTypeRole</key>
+        <string>Editor</string>
+        <key>CFBundleTypeName</key>
+        <string>JP2</string>
+        <key>LSItemContentTypes</key>
+        <array>
+          <string>public.jpeg-2000</string>
+        </array>
+      </dict>
+      <dict>
+        <key>CFBundleTypeRole</key>
+        <string>Editor</string>
+        <key>CFBundleTypeName</key>
+        <string>PNG</string>
+        <key>LSItemContentTypes</key>
+        <array>
+          <string>public.png</string>
+        </array>
+      </dict>
+      <dict>
+        <key>CFBundleTypeRole</key>
+        <string>Editor</string>
+        <key>CFBundleTypeName</key>
+        <string>TIFF</string>
+        <key>LSItemContentTypes</key>
+        <array>
+          <string>public.tiff</string>
+        </array>
+      </dict>
+      <dict>
+        <key>CFBundleTypeRole</key>
+        <string>Editor</string>
+        <key>CFBundleTypeName</key>
+        <string>BMP</string>
+        <key>LSItemContentTypes</key>
+        <array>
+          <string>com.microsoft.bmp</string>
+        </array>
+      </dict>
+    </array>
+
   </dict>
 </plist>
diff --git a/NAPS2.Lib.Mac/EtoForms/Mac/MacEtoPlatform.cs b/NAPS2.Lib.Mac/EtoForms/Mac/MacEtoPlatform.cs
index c1c67dc6b..c6837ccc8 100644
--- a/NAPS2.Lib.Mac/EtoForms/Mac/MacEtoPlatform.cs
+++ b/NAPS2.Lib.Mac/EtoForms/Mac/MacEtoPlatform.cs
@@ -6,6 +6,7 @@ using Eto.Mac.Drawing;
 using NAPS2.EtoForms.Layout;
 using NAPS2.EtoForms.Widgets;
 using NAPS2.Images.Mac;
+using NAPS2.Remoting;
 
 namespace NAPS2.EtoForms.Mac;
 
@@ -23,7 +24,9 @@ public class MacEtoPlatform : EtoPlatform
 
     public override Application CreateApplication()
     {
-        return new Application(Platforms.macOS);
+        var application = new Application(Platforms.macOS);
+        ((NSApplication) application.ControlObject).Delegate = new MacAppDelegate();
+        return application;
     }
 
     public override void Invoke(Application application, Action action)
@@ -160,4 +163,20 @@ public class MacEtoPlatform : EtoPlatform
         });
         control.UnLoad += (_, _) => NSEvent.RemoveMonitor(monitor);
     }
+
+    private class MacAppDelegate : AppDelegate
+    {
+        public override bool OpenFile(NSApplication sender, string filename)
+        {
+            Task.Run(() =>
+                ProcessCoordinator.CreateDefault().OpenFile(Process.GetCurrentProcess(), 100, filename));
+            return true;
+        }
+
+        public override void OpenFiles(NSApplication sender, string[] filenames)
+        {
+            Task.Run(() =>
+                ProcessCoordinator.CreateDefault().OpenFile(Process.GetCurrentProcess(), 100, filenames));
+        }
+    }
 }
\ No newline at end of file
diff --git a/NAPS2.Lib/Remoting/ProcessCoordinator.cs b/NAPS2.Lib/Remoting/ProcessCoordinator.cs
index edaea150f..e0996c0aa 100644
--- a/NAPS2.Lib/Remoting/ProcessCoordinator.cs
+++ b/NAPS2.Lib/Remoting/ProcessCoordinator.cs
@@ -65,9 +65,12 @@ public class ProcessCoordinator(string instanceLockPath, string pipeNameFormat)
         TrySendMessage(recipient, timeout,
             client => client.ScanWithDevice(new ScanWithDeviceRequest { Device = device }));
 
-    public bool OpenFile(Process recipient, int timeout, string path) =>
-        TrySendMessage(recipient, timeout,
-            client => client.OpenFile(new OpenFileRequest { Path = { path } }));
+    public bool OpenFile(Process recipient, int timeout, params string[] paths)
+    {
+        var req = new OpenFileRequest();
+        req.Path.AddRange(paths);
+        return TrySendMessage(recipient, timeout, client => client.OpenFile(req));
+    }
 
     public bool TryTakeInstanceLock()
     {