PFILE.LSP v1.0 Consists of several routines to Set/Save/Recall/Display numbered
points to a data file with the same path and first name of the
current drawing file but with the extension ".PTS"
Due to the varied answers that releases earlier than R14 might
return for "DWGPREFIX" and "DWGNAME" it is recommended for use
only with R14+.
Being "Freeware" there is no built-in error recovery.