Given files by client:
.dwg .bak
QGIS doesn't like it; FREECAD doesn't like it; RhinoCAD doesn't like it or Illustrator.
QGIS > Project > Import as .dwg/.dxf actually asks for .gdb, which doesn't help.
Found previous answer here: Converting .dwg to .shp using QGIS?
but it's not complete and from 2012.
Convert from DWG to DXF to SHP:
Download and open ODA File converter: https://www.opendesign.com/guestfiles
Convert DWG to DXF (Choose lastest year - mine was 2018 - ASCII DXF)
Use QGIS Plugin 'Another DXF Import/Converter' to add from folder to new folder (Don't forget to click 'Save as shapefiles')
Loads in QGIS in layers
2020/01/19