> I came across the situation when some of my older lyx files could no longer > compile under new versions of LyX.
looking on the commit history this line has been introduced by Herbert http://www.lyx.org/trac/changeset/3881 and the only interesting change was made by http://www.lyx.org/trac/changeset/5238 both 6 years back, so i'm not sure what you mean by new version :) but may be lyx2lyx do some nasty thing or detection of file_exists changed. pavel
