Lost file

I recorded to audicity. Then I edited, normalized, saved. I deleted the bak file. When I tried to open my edited file I received this message: Could not find the project data file. This has happened before. Can I retreve this file and what am I doing to cause this loss of file?

At the top of this section of the forum (“Forum Index ‹ Administrativia ‹ Forum Issues”) is a topic that says “README”