I'm not sure where best to ask this question, but as it seems to be related to the security infrastructure I figured I'd start here.
I have a file with a .planner extension (created with Imendio Planner 0.13). The problem is if I double click on the file instead of launching the application and loading the file as expected I get the following error.
Cannot open filename.planner
The filename "filename.planner" indicates that this file is of type "Planner project plan". The contents of the file indicate that the file is of type "plain text document". If you open this file, the file might present a security risk to your system.
Do not open the file unless you created the file yourself, or received the file from a trusted source. To open the file, rename the file to the correct extension for "plain text document", then open the file normally. Alternatively, use the Open With menu to choose a specific application for the file.
Strictly speaking it is both a .planner file and text as the .planner format is just XML. The question is what do I need to adjust to get this to launch as expected? My current workaround is to launch planner and then open the file from there, but I'd prefer not to have to do this.