Unable to open scripts

Question

Whenever I try to open a script for editing, I get an "Unable to open Assets/Scripts/PlayerController.cs: Check external application preferences" error.

This is a new script. I have not moved it in my file browser.
Under "Preferences > External Tools" I have External Script Editor set to "MonoDevelop (build-in)".
I have just reinstalled Unity, and made sure the "MonoDevelop" option was selected.

I'm running Unity 4.5.5f1 on Windows 7.

Anybody know what's going wrong?

EDIT: I've tried manually finding the .exe in the External Script Editor preference (using "Browse..."). Now I have a new error: A terminal pops up for a split second with the message "Cannot open assembly '': File does not contain a valid CIL image."

Answer 1

Answer by Graham-Dunnett · Nov 12, 2014 at 06:40 PM

Shut down Unity. Then find a .cs file in Explorer. Double-click it, and I think Windows won't know what to use to open it. Tell Windows to open the script file with MonoDevelop.

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TheTrippmeister · Nov 12, 2014 at 07:15 PM 0

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$$anonymous$$onoDevelop is not on the list of applications I can open the file with. I can browse for it within the Unity program files, but I can't add it to the list.

MrSoad · Nov 12, 2014 at 07:52 PM 0

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This guy had a similar problem and has fixed it, he did not yet say what the application that caused the problem for him was, but I have just asked him if he would say.

http://answers.unity3d.com/questions/823553/monodevelop-is-not-being-installed.html

There is no guarantee the cause is the same but it is worth checking just in case, provided he gives the relevant info...

Answer 2

Answer by Roomi_PK · Aug 07, 2020 at 02:44 AM

I am having a similar problem. In my case there is a .dll file which is being mentioned in error. Exact text is as under

Unable to open Packages/com.ptc.vuforia.engine/Vuforia/Plugins/Managed/iOS/Vuforia.UnityExtensions.dll: Check external application preferences.

Now I have manually checked, .dll file exists. I have no idea what is going on. Previously it was working fine. Interestingly this error only occurs when I try to edit "Default Image Behaviour (Script)"... all other scripts are being loaded by Visual Studio 2017 perfectly. Things went bad when I installed iOS build support along with already Android built support.

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Unable to open scripts

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