DGN files are two-dimensional or three-dimensional computer-aided design (CAD) architecture drawing files. They are created and opened with many different programs in the Autodesk AutoCAD line of computer programs, including AutoCAD LT. If you want to open a DGN file and make changes to it, or just take a look at the information that it already contains, you can do so natively in AutoCAD LT.
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Open AutoCAD LT by clicking its icon in the "Autodesk" folder of your "Start" menu.
Select the DGN file you want to open, then click the button labelled "Open" to view the file in AutoCAD LT.
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