After installing the April Cumulative Update KB3147458, the following error may pop up when opening the Group Policy Editor.
Resource ‘$(string.RequirePrivateStoreOnly)’ referenced in attribute displayName could not be found.
File C:\WINDOWS\PolicyDefinitions\WindowsStore.admx, line 140, column 9
Although dismissing the error messages (occurs twice) should allow you to use the Group Policy Editor, the “Store” category may be missing from Windows Components, under Computer Configuration and User Configuration.Read more