Can't open .manager file back-up

Good morning. I’m brand new to Manager. I was able to back-up my information. It was saved as a .manager file. I went to open the back-up and it says “There is no application set to open the document.” I’m using a MacBook Pro. Can anyone assist me?

Open your Manager Application,
Add Bussiness - Import Bussiness

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Select your Manager File (*.manager)

Thank you!!!