Autocad backup files

[rstewartBDDFE]

Good morning, I have a general question in regards to Autocad Civil 3D backup files. I recently tried to open a backup file and was prompted to select a software in which to open the (.bak) file, I went ahead and selected standard Autocad 2d to open the (.bak) file. However, the back up file did not open. In addition, all of my backup files now appear as a standard Autocad 2D file. My question question is

1. How do I open up AutoCad Civil 3d (.bak) files

2. How do I convert the (.bak) files from showing the standard AutoCad 2D symbol to the original (.bak) file icon. 

Thank  you!

[tcorey]

Change the file extension to .dwg and then AutoCAD will open it.

[user181 · Accepted solution]

To open a .bak file you need to rename the file and change the .bak to .dwg and then open the file.

To remove the file association of .bak follow the instructions HERE

[rstewartBDDFE]

Thank you both!