diff --git a/Mac/MainWindow/NNW3/NNW3ImportController.swift b/Mac/MainWindow/NNW3/NNW3ImportController.swift
index 32084490e..9a6f4a977 100644
--- a/Mac/MainWindow/NNW3/NNW3ImportController.swift
+++ b/Mac/MainWindow/NNW3/NNW3ImportController.swift
@@ -8,6 +8,7 @@
 
 import AppKit
 import Account
+import UniformTypeIdentifiers
 
 struct NNW3ImportController {
 
@@ -69,7 +70,7 @@ private extension NNW3ImportController {
 		panel.canChooseDirectories = false
 		panel.resolvesAliases = true
 		panel.directoryURL = NNW3ImportController.defaultFileURL
-		panel.allowedFileTypes = ["plist"]
+		panel.allowedContentTypes = [UTType.propertyList]
 		panel.allowsOtherFileTypes = false
 		panel.accessoryView = accessoryViewController.view
 		panel.isAccessoryViewDisclosed = true
diff --git a/Mac/MainWindow/OPML/ExportOPMLWindowController.swift b/Mac/MainWindow/OPML/ExportOPMLWindowController.swift
index 4b2ce20a6..2d2ac30cf 100644
--- a/Mac/MainWindow/OPML/ExportOPMLWindowController.swift
+++ b/Mac/MainWindow/OPML/ExportOPMLWindowController.swift
@@ -8,6 +8,7 @@
 
 import AppKit
 import Account
+import UniformTypeIdentifiers
 
 class ExportOPMLWindowController: NSWindowController {
 
@@ -75,7 +76,7 @@ class ExportOPMLWindowController: NSWindowController {
 	func exportOPML(account: Account) {
 		
 		let panel = NSSavePanel()
-		panel.allowedFileTypes = ["opml"]
+		panel.allowedContentTypes = [UTType.opml]
 		panel.allowsOtherFileTypes = false
 		panel.prompt = NSLocalizedString("Export OPML", comment: "Export OPML")
 		panel.title = NSLocalizedString("Export OPML", comment: "Export OPML")
diff --git a/Mac/MainWindow/OPML/ImportOPMLWindowController.swift b/Mac/MainWindow/OPML/ImportOPMLWindowController.swift
index f0737fe93..1db6ca6d2 100644
--- a/Mac/MainWindow/OPML/ImportOPMLWindowController.swift
+++ b/Mac/MainWindow/OPML/ImportOPMLWindowController.swift
@@ -8,6 +8,7 @@
 
 import AppKit
 import Account
+import UniformTypeIdentifiers
 
 class ImportOPMLWindowController: NSWindowController {
 
@@ -85,7 +86,7 @@ class ImportOPMLWindowController: NSWindowController {
 		panel.allowsMultipleSelection = false
 		panel.canChooseDirectories = false
 		panel.resolvesAliases = true
-		panel.allowedFileTypes = ["opml", "xml"]
+		panel.allowedContentTypes = [UTType.opml, UTType.xml]
 		panel.allowsOtherFileTypes = false
 		
 		panel.beginSheetModal(for: hostWindow!) { modalResult in
diff --git a/Mac/ShareExtension/ShareViewController.swift b/Mac/ShareExtension/ShareViewController.swift
index 2d7558063..d8e655a0a 100644
--- a/Mac/ShareExtension/ShareViewController.swift
+++ b/Mac/ShareExtension/ShareViewController.swift
@@ -8,6 +8,7 @@
 
 import Cocoa
 import os.log
+import UniformTypeIdentifiers
 
 class ShareViewController: NSViewController {
 
@@ -33,14 +34,14 @@ class ShareViewController: NSViewController {
 		// Try to get any HTML that is maybe passed in
 		for item in self.extensionContext!.inputItems as! [NSExtensionItem] {
 			for itemProvider in item.attachments! {
-				if itemProvider.hasItemConformingToTypeIdentifier(kUTTypePropertyList as String) {
+				if itemProvider.hasItemConformingToTypeIdentifier(UTType.propertyList.identifier) {
 					provider = itemProvider
 				}
 			}
 		}
 
 		if provider != nil  {
-			provider!.loadItem(forTypeIdentifier: kUTTypePropertyList as String, options: nil, completionHandler: { [weak self] (pList, error) in
+			provider!.loadItem(forTypeIdentifier: UTType.propertyList.identifier, options: nil, completionHandler: { [weak self] (pList, error) in
 				if error != nil {
 					return
 				}
diff --git a/Shared/Extensions/UTType+Extensions.swift b/Shared/Extensions/UTType+Extensions.swift
index c3e307c91..77edccdc5 100644
--- a/Shared/Extensions/UTType+Extensions.swift
+++ b/Shared/Extensions/UTType+Extensions.swift
@@ -7,3 +7,9 @@
 //
 
 import Foundation
+import UniformTypeIdentifiers
+
+extension UTType {
+	
+	static let opml = UTType("public.opml")!
+}