How turn on the function (Preserve file modification times) of saved files?

[helium]

helium last edited by

I downloaded portable version of Opera - OperaPortable_68.0.3618.104.paf.exe
from https://portableapps.com/apps/internet/opera_portable
via:

1. Firefox v25 (2012) with option "Preserve file modification times when possible".
2. Firefox v56 (2018). There is not the option.
3. Opera v68 (2020). There is not the option.

There is difference of modification time between Opera and Firefox.
Nobody did not modificate the file from 2020-05-13 on https://portableapps.com/apps/internet/opera_portable
Why Opera don't preserve modification time of saved files?
How turn on the function?
My current system is Windows7-64 on notebook (2012) i5-HM65-16Gb Geforce-GT540M-1Gb hdd-1Tb.
There are screenshots below.
Via Firefox v25 (2012) https://portableapps.com/apps/internet/opera_portable
http://b.radikal.ru/b28/2005/17/40fb716ff4f2.png
Settings of Firefox v25 (2012):
http://d.radikal.ru/d33/2005/8d/322d1c5fb670.png
The write times for 3 downloads (FF v25, FF v56, Opera):
http://d.radikal.ru/d41/2005/09/eaf257d1e422.png

[leocg]

leocg Moderator Volunteer @helium last edited by

@helium You should download Opera Portable from www.opera.com

[leocg]

leocg Moderator Volunteer @helium last edited by

@helium There is no such option.

By the way, what it supposed to do?