The aeccland.shx file is an Autodesk Civil 3D "shape" file used to render specialized landscape linetypes like treelines, hedges, and bushes. Missing this file results in errors, while a known plotting bug causes it to appear as dots instead of symbols. To resolve issues, the file should be installed in the AutoCAD fonts folder or added to the support search path. For more details, visit Autodesk Community forums.autodesk.com/t5/civil-3d-forum/missing-shx-file-s/td-p/7448410. Missing Shx File(s) - Forums, Autodesk
The prefix "aec" in "aeccland.shx" suggests that this particular shape file might be related to Architectural, Engineering, and Construction (AEC) content, possibly specifically for landscape or land development designs. aeccland.shx
A frequent headache for CAD users is receiving a "Missing SHX Files" error when opening a drawing. This happens when a drawing uses a linetype or text style dependent on aeccland.shx , but the file is not in the program's search path. The aeccland
If you need particular this file, it's in attachment. I got it from "C:\Program Files\Land Desktop 2005\Support" directory. AUGI Forums Missing Shx File(s) - Forums, Autodesk For more details, visit Autodesk Community forums