March 25, 2014 - Autodesk releases a Hotfix for AutoCAD 2013 64-bit products for Windows 8.1
Mar 25, 2014 - Autodesk releases AutoCAD 2013 Model Documentation Hotfix for Windows® 8.1
The hotfix fixes Model Documentation and IMPORT command related issues found in AutoCAD 2013 based products on 64 bit Windows® 8.1
IMPORTANT: Note that this hotfix applies only to 64 bit versions of Windows® 8.1. There is no need to apply this hot fix if you are running AutoCAD 2013 on any other operating systems.