DXF is a Drawing eXchange Format created by Autodesk for exchanging data between various CAD packages. DXF files can be imported into most CAD software, not only Autodesk software (e.g. AutoCAD, Revit). DXF format is publicly documented, as opposed to Autodesk’s proprietary DWG format.
DXF files only store numerical coordinates, but do not store measurement units for those coordinates. iGUIDE DXF files store all coordinates in millimetres, which is signified by the Metric DXF naming. Incidentally, if the coordinates in iGUIDE DXF file were stored in metres, the files would still be called Metric.
Our system does not provide DXFs in imperial units, such as inches or feet. However, when importing a DXF file into CAD software, you can apply any scale factor of your choice, depending on which units you need to work with in the CAD software. For example, to work in inches, you would choose the scale of 25.4 and to work in metres the scale of 1000. This selection can usually be made in the import dialog.
Figure 2 - Metric DXF Download link