Hello,
So I Reformatted my PC and installed the Launcher + UE4.15.
I am able to make a project and load a existing project whilst UE4 is open. After Setting the .uproject default program to UE4Editor.exe I am now able to open them directly.
However when I try to load a project from inside the launcher both new and old, I am prompted with the error message
I am unsure what to do.
Cheers
Hello,
same error for me, trying to re-install the engine and the launcher, clean some windows registry key about “Epic Games” and still not working.
Hello Kuuwahi,
Your issue appears to be with the launcher, and not the engine itself, for help with launcher issues please visit http://help.epicgames.com/
Thanks
Well,
I have just formatted my entire PC, Removed all Epic Games Related content (Except Projects).
And came back to the same issue.
Hello,
I have solved my problem by copy the content of Launcher > Binaries > Win64 and paste to the 4_15 > Binaries > Win64 after that I have executed the UnrealVersionSelector.exe inside the 4_15 Win64.
A dialog window ask me if it’s the directory is an unreal engine installation, click on yes and a message appear “Successfull registration” everything work now.
I hope that can help you.
Not sure how you discovered this, However after following your solution I can now confirm that this worked for me and all projects now load via the launcher.
After Contacting Via the link you provided, they initially said it wasn’t their dept and to post on here. After I explained that I had they took a look at this page then forwarded it on to the launcher department to which I am waiting for a reply.
However as seen below, I followed this persons solution which solved the issue.
Discover after 3 days of trying 
glad to see it’s working for you.
Mr. ThomasVanZeeland,
I have exactly the same error. I think the latest launcher has the bug.
Could you please try the following steps?
.uproject has not been associated to Unreal Engine, and cannot open either by double-clicking the .uproject or double-clicking the icon on My Projects of Launcher.
I clean-installed my PC twice but the above problem happened.
Hi there,
Thank you for the report. The launcher is supposed to be registering uproject file associations for you, we are looking into why that could no longer be working.
In the meantime, the best way to workaround the problem would to manually register using the correct tool, provided with the launcher.
Here is a step by step example on Windows 10
Please let me know if anyone is having issues with this, too.
Navigate to the launcher install directory, and find UnrealVersionSelector.exe
For me, it is located here:
Launcher\Engine\Binaries\Win64\UnrealVersionSelector.exe
Right-click the exe and select Create Shortcut option.
On this new shortcut file, right-click and select properties. Then, in the Target field, add -fileassociations to the end, and press Apply. It should look like this:
Now right-click the shortcut again, this time select Run as Administrator. After a short time, uproject files should now work correctly, including context menus items that look like so:
Thank you so much for the instruction!
I think one of the possible reason is that Unreal Engine is now installed to
C:\Program Files\
folder instead of
C:\Program Files (x86)\
at least with the latest launcher.
Previously, both Unreal Engine and Launcher had been installed to
C:\Program Files (x86)\
Now, with the latest Launcher, Launcher is still installed to
C:\Program Files (x86)\
and each Unreal Engine is installed to
C:\Program Files\
I don’t think this is the root of the issue to be honest. As mine has always been installed in its own directory on a dedicated SSD (S:/Epic Games)
Thank you for the comments. We have identified the issue and working on releasing the fix asap.
I am also experiencing this problem. I purchased a new computer over the weekend. My team has recently upgraded our current project to 4.15 from 4.14. My old pc was running Win 10 Professional, this new one is is running Win 10 Home. Not sure if that makes a difference. However, I have been running through the forums all day looking for a solution. I have this problem with projects downloaded from our team source control, projects in 4.14., 4.15, new projects I created. However, at one point i was able to get the project to load if I launched engine and then selected the project. So, somehow, the version selectors is not in the install. After searching through the soultions here,
Each solution references this file
UnrealVersionSelector.exe
This file is nowhere to be found. I looked in the both Epic program locations. The launcher in the Launcher\Engine\Binaries\Win64\
and the engine folders in C:\Program Files\Epic Games\
This is also happening on laptop. Running Win 10 Edu. Macbook that has been bootcamped.
Can you help me out please I’m lost as to where you’re speaking about. If it’s the or the Program Files alone and what exactly did you copy Sir? Please help?
Can you help me out please I’m lost as to where you’re speaking about. If it’s the or the Program Files alone and what exactly did you copy Sir? Please help? I really want this to work. Maybe you can contact me on discord so it’s easier for me?
I have to confirm that this method is truly correct. Thank you so much for sharing this advise!
Hey all, since the Launcher update 2.12.27, the issue should be fixed now and anyone without the correct associations should be prompted.
Thanks again!
I have this same problem in version 4.18 is there any way to fix it?
