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I have imported several drawings from DraftSight into AutoCAD 2010 LT. Even though they have been saved in the 2010 format, when reopening them I get a "Proxy Information" window appearing indicating there are Object Enblers missing and the following aplications are missing; AecBase60, AecArchBase60, AecBaseEx60 and AecArchDACHBase60. How can I install or find these missing files to resolve the problem?