I'm in a file and the Modeling Workflow is not available.
The Modeling workflow will only be available when you are in a 3D file. If you do not see it available, more then likely you are in a 2D file. In the Application Title it will tell you whether the current file you are in is a 2D or 3D file in addition to the file format.
If there is a command you need for that file, you can always use File | User | Settings | Tool Boxes and find the command or toolbox from there.
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