In AutoCAD 2004, there is the "Delete all" button in the Named layer filter part of the Layer Properties Manager. In AutoCAD 2005, 2006, 2007 and higher, select your Layer filters in the Layer Properties Manager dialog, right-click and choose Delete.
In older AutoCAD versions (or in AutoCAD 2004/2005) you can perform the following VBA macro to erase (remove) the layer filters (use e.g. the VBASTMT command, all on a single line):
For Each ent In ThisDrawing.Layers.GetExtensionDictionary("ACAD_LAYERFILTERS"): ent.Delete: Next ent
In AutoCAD 2005, add also (single line):
For Each ent In ThisDrawing.Layers.GetExtensionDictionary("ACLYDICTIONARY"): ent.Delete: Next ent
There is also the "REMLAY" VLISP downloadable from the CAD Studio VIP server. Or you can use the DeleteFilters.VLX utility available on www.cadstudio.cz/download(APPLOAD the VLX file).
In AutoCAD 2006 and higher you can also use FILTERS command.
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