Fix Unity file extensions?

Unity Engine
1

Hello, I installed Unity5 and then uninstalled my Unity4.5 after (had to make sure my old projects worked on 5).

Since I uninstalled my 4.5, all Unity file associations were removed. So now Scene files and Package files no longer work when clicked.

I changed them to use the Unity.exe file, but now clicking a Scene or Package file tries opening a new Unity editor, instead of loading them into the current editor.

Any way to fix this without reinstalling unity? Thanks!


(That project is currently open, but clicking a scene or package file tries to open a new editor)

2

Unity needs the “-openfile” argument to open scenes and packages. The default association created on Windows won’t do that. You can use the registry editor to modify the association. You need a “shell → open → command” hierarchy as displayed in the attached screenshot. You can put that directly under the .unity file type in HKEY_CLASSES_ROOT (the Unity installer sets up a separate “Unity scene file” type as you can see in the image).

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3

Hi Rene, thanks for the quick response!

I followed your instructions and added the hierarchy under HKEY_CLASSES_ROOT/.unity so it looks like this:

However unity scenes/packages still do not open correctly. Do I need a reboot, or have I done it incorrectly?

Thanks

4

Sorry, my bad. The “shell” key under the file type doesn’t work. It has to be under the corresponding handler. In short, set the default key on the file type (like “.unity”) to a new key (such as “Unity scene file”) under the same HKEY_CLASSES_ROOT which contains the “shell” key hierarchy.

5

I see now that .unity has the data of Unity scene file.
I created Unity scene file with the shell>open>command hierarchy and the proper data however it still doesn’t work.

BUT, it’s not a huge deal. I can just reinstall unity at some point, or it might fix itself when I grab the update. :slight_smile:
Thanks anyway for the help Rene!

6

I have the same problem I just deleted unity 4.6 and unity 5 , then I reinstalled unity 5 again , but it still dosent work any solution ? :confused:

7

I have found a solution , first of all uninstall all unity on your pc , and download ccleaner and make it delete all corrupted registry files then download unity 5 , hope this helps !

8

Here’s the way I fixed it (alternative to dero’s above method)

  1. Uninstall unity
  2. Reinstall unity 5 (scene/package files should no longer be associated with anything)
  3. Try opening a scene. When windows asks which program to use, select unity.
    ^ Doing this after a fresh install will automatically make scenes open properly. However during this without a fresh install will cause my problem listed above.