This is not a real bug, but it is maybe unintended, and might confuse new users.
When you try to open imported files within the editor (for instance a json file), then the file doesn't open, if the program to open the file with, is not already specified in Windows.
Maybe a massage, that the program to open the file, should be selected in Windows first.
Operating System and Service Pack
Windows 7 Ultimate (newest SP)
Construct 2 Version ID