- Open the Preference dialog and go to General/Editors/File Association. Add a new file type with the *.launch suffix. In the ‘Associated Editors’ box below, click on Add and assign the XML editor to the file type.
- In the Preferences dialog go to General/Appearance/Content Types. Click on the + next to Text. Click on ‘XML’ in the tree so that it is highlighted. Click ‘Add’ in the box below and add the *.launch suffix