Could not load file or assembly 'Microsoft.Windows.Design.Extensibility, Version=


Anyone familiar with this issue? This pops up when I open the main workflow, and some workflows of the framework folder is not opening… UiPath Studio is enterprise.

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Are you facing issue with only this project or with all other projects too ?

Hello. Only with this project. Tried to create a new project but no issues.

Hoping not to rebuild everything… because we are moving the source code from dev environment to prod


Can you check once whether all packages are there or not in production machine the one used in Development machine.

Please raise a support ticket so we can inspect this properly. As enterprise you are entitled to proper support.

In 21.4 we had some intermittent issues but we are confident that these are fixed for 21.10.

Hi @Riomel_Martos,

Can you please check under Manage Packages settings window at project level, if all below options are checked along with

And then try again.

Alternatively, you can enable this at studio level from studio backstage view->Settings->manage sources as shown below:


Hi, I checked with that but still same problem


Are you experiencing the same issue? If so, could you please let us know more details about your environment and versions of your Studio, as well as when did it start happening?