@Aleksandr.Makarov 

A new Analyze..Ray Database Viewer (or Path Analysis or Flux vs. Wavelength Analysis) has an updated list (without deleted files) for me. Out of curiosity, why is that a problem?

Take care

David

@David.Nguyen if I make multiple zrd with different numbers of rays and system modification. than I have 10..20+ files. it hard to find proper file and old files may be obsoleted. so I like delete them. 

but current zemax version have slow start. for this reason I prefer dont close it.

Thank you