GnuCash Files names

[Denis_gmail]

There is something I don't understand in the file names used by
GnuCash.

I must miss something...:-(
Today I save the file as usual when exiting (today is >2017-07-20< and
the file name used by GnuCash was:)

den.gnucash.20161107142750.gnucash.20161201140745.gnucash.20170208132409.gnucash.20170209101150.gnucash

What is even more strange is the fact that this file name NEVER change. 
It's always the same and not related to the date.

Any comments ?

Den