The link
http://www.semverteilung.vwl.uni-muenchen.de/links/LyX1.3.5_LaTeXConfigFix.zip
privides an easy (albeit primitive) fix for the problem that Edit -> Reconfigure gives you an empty file in Help -> LaTeX Configuration. This is due to a bug in in the stream editor (sed.exe) . Replacement of the sed.exe by a newer one gives rise to other errors. My solution is to use another sed - named here HHSED - for producing the LaTeXConfig.lyx file.
The changes are in the config and the config.bat files. They are documented in these files.
Ekkehart Schlicht
