To fix the error you are seeing, you need to follow the instructions and modify the Energy+.idd file from the answer to this other question. There is not a bug and it is really not a "crash" but IDF Editor will not open an IDF file unless the Energy+.idd file has enough fields defined for all objects in the IDF file. At this point IDF Editor simply does not auto-extend like EnergyPlus does. Automatically extending extensible fields is one of the new features in the list shown on this issue. I just added a new feature idea on the EnergyPlus feedback Uservoice if you want to vote on it.

To fix the error you are seeing, you need to follow the instructions and modify the Energy+.idd file from the answer to this other question. There Their is not bug and it is not really not a "crash" but IDF Editor it will not open an IDF file unless the Energy+.idd file has enough fields defined for all objects in the IDF file. defined. At this point IDF Editor simply does not auto-extend like EnergyPlus does. auto-extend. Automatically extending extensible fields is one of the new features in the list shown on this issue. I just added a new feature idea on the EnergyPlus feedback Uservoice if you want to vote on it.