I was able to open the file a few years ago in construct 2.
Have you tried opening it in the current latest release of Construct 2 ? Does it open as is ?
There might have been some breaking changes from Construct 2 since saving your project file.
Send your capx to email@example.com, we will have a look and see if your project file can be recovered or not in order to open it in Construct 3.