Question

I am trying to register my app as being able to open text files. Based on some digging, below is what I tried and while it compiled, it didnt work. When I go into dropbox and try to launch a txt file, I get ‘No installed apps support opening this file’. What do I need to do to make my app show up for any txt file?

<key>CFBundleDocumentTypes</key>
<array>
<dict>
<key>CFBundleTypeName</key>
<string>Text File</string>
<key>CFBundleTypeRole</key>
<string>Viewer</string>
<key>CFBundleTypeExtensions</key>
<array>
<string>txt</string>
<string>TXT</string>
</array>
<key>LSHandlerRank</key>
<string>Alternate</string>
<key>LSItemContentTypes</key>
<array>
<string>public.txt</string>
</array>
</dict>
</array>

Answer 1

My app imports TXT files, too.
Change your Info.plist:

• Change public.txt in the listing above to com.myapp.txt (or whatever you want)

• After the last </array> of your listing above add:

  <key>UTExportedTypeDeclarations</key>
  <array>
  <dict>
      <key>UTTypeConformsTo</key>
      <array>
          <string>public.text</string>
      </array>
      <key>UTTypeDescription</key>
      <string>Plain Text Document</string>
      <key>UTTypeIdentifier</key>
      <string>com.myapp.txt</string>
      <key>UTTypeTagSpecification</key>
      <dict>
          <key>public.filename-extension</key>
          <string>txt</string>
          <key>public.mime-type</key>
          <string>text/plain</string>
      </dict>
  </dict>
  </array>
  

You may replace com.myapp.txt with whatever identifier you want.
I hope this helps.