Joe, the .stream file should be located in the content directory, you can find it inside [install-dir]/content
It should be called someFile.stream, and not someFile.stream.txt
To start Wowza in stand alone mode, first make sure Wowza is stopped, on Windows:
1:Open a Command Prompt window (press WIN key + R, type cmd in the Run dialog box, and then press ENTER).
2:Execute the following commands:
To stop Wowza open a terminal window and enter the following command:
These commands assume you are running Wowza 4.0.1.
If you have not read the Quick start guide, it would be very helpful:
Wowza Quick Start Guide
As well as the user guide:
Wowza User Guide