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Even after installing Windows Media Format 9.5, AutoCAD 2009 may still complain. Here is the fix: download windows media format 9.5 autocad 2009
Since Microsoft no longer actively hosts standalone downloads for this legacy runtime, you can use two reliable workarounds to get AutoCAD 2009 running. Method 1: Edit the AutoCAD Setup File (Highly Recommended) Solving the Legacy Puzzle: How to Download Windows
Installing such an old version of AutoCAD on modern systems presents several hurdles: Unsupported Software download windows media format 9.5 autocad 2009