Some filenames ending with tilde

[Daniel CLEMENT]

Hello,

I'm still rather new to using LyX on a Mac, and I have a couple more
questions, here is the 1st:

I've just recently noticed that some .lyx~ files remain alongside my
regular LyX documents.

They are not hidden, but the Mac file browser adds a subtitle to them: 
"non admissible" (in French...)

Shouldn't they be erased automatically? Is there a setting that I'm
missing?

Thanks in advance - BR, Daniel