When importing a DXF file (containing 3D contour data) to QGIS, none of the various methods described elsewhere are retaining elevation data as an attribute.
e.g. DXF2SHP, GRASS v.in.dxf, opening natively as a vector file in QGIS etc. DXF2XYZ is not applicable as the file does not contain point data.
The DXF file contains polylines with elevation data only. All line objects are imported successfuly and there are no errors. Are there any other utilities?