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XAR File Format. Corel Xara drawing. The XAR extension is commonly used with files created by Xara Xtreme, a 2D vector graphics editor developed by the British company Xara, which is now a wholly-owned subsidiary of the German firm MAGIX AG.
Topics covered in this Lesson: XRefs (External Reference Files in AutoCAD) An XRef is an âexternal reference' to another AutoCAD drawing file. One file can reference many other files and display them as if they were one. These are used in larger projects for many reasons: They keep the file sizes down.