>How can I get the long name of a file, given its short name? The kernel32 GetLongFileName function [updated...] requires NT5 or greater, so I'm a bit stuck here.

Found an alternative:

FUNCTION GetLongName
LPARAMETERS tcShortName
LOCAL ARRAY laDir(1)

IF ADIR(m.laDir,m.tcShortName)=1
  RETURN ADDBS(JUSTPATH(m.tcShortName))+m.laDir(1)
ENDIF

RETURN ""
ENDFUNC

The path will remain in short form (left for a function revision, later on) but at least the file is fully identified by its long form.