[NFBCS] "File not Found" on Save As in Adobe Audition 1.5

[Dale HELTZER]

I have Windows 10, and I'm still using my old Adobe Audition (and even CoolEdit 2000).
After the latest Windows Update, I wanted to save an edited WAV file as MP3 in Audition.
"File not Found" was the puzzling message.
I'm kind of nonplussed.
Anyone have recommendations, or even an explanation?
TIA