"Empty" 3D file

[ragegoblin]

Hello! I am new to 3D printing and to this forum, seeking help for a design my friend created. When I open the attached file in the slicer there is no object. Attempting to Slice produces the following error: "G-Code failed to open. Try again." I am using the AnkerMake M5 and the AnkerMake software. We've tried multiple file types, but no luck. What can I do to print this file? Thanks for any advice.