Is this an El Capitan bug? I've noticed in more than one app, when I go to File –> Open, the app opens the file in a new window instead of in the existing window. For example, in TextEdit, if you open a new document, and then from that blank document open a saved document, TextEdit opens the saved document in a new window and leaves the original document open as a blank document. This happens in other apps too. I never saw this happen prior to El Capitan so I'm wondering if it's a bug or intentional for some unknown reason.
MacOS – Why do apps in El Capitan open a new window when opening a file
macostextedit
Related Solutions
This is the resume feature of OS X Lion.
You can use TinkerTool do disable resume on a per-app basis.
Besides this, TinkerTool gives you access to additional preference settings and allows to activate hidden features in the operating system.
I've also explained how to disable resume using the Terminal here.
Does setting the assign to Desktop:none; work for you.
You can do this from the Applications Dock menu.
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Best Answer
TextEdit has always operated this way. Most applications do.