saved drawing empty

I had saved a drawing about new house yesterday.
Today, if i will open it, the drawing is complete empty and there are 2 chrash files in the folder.

Coud be that in the file open dialog is selected "Qcad 1.x file" as file type?
If so, please select "Drawing exchange"

The other files you see are backups that Librecad generates automatically, if I am not mistaken.

HTH
Pere