Quando exporto fotos do Lightroom para o Pc, as fotos ficam bastante mais escuras.

I didn't install anything new.
And both on my Pc and my colleague's, the same thing happens.

I used already: Faststone (I use always and never gave problems) and

Irfanview.

When I export the photos through the web lightroom, this problem does not happen.

So can you confirm that you are on Windows 10?

Have you enabled color management in FastStone? Settings > CMS, both boxes must be checked. 

In Irfanview, color management is enabled by going to Properties/Settings > Color management.

When you change these settings, both applications must be restarted for the changes to take effect.

Não instalei nada novo. 
E tanto no meu Pc como da minha colega, acontece o mesmo. 

Usei já: Faststone ( Uso sempre e nunca dei problemas) e IrfanView.

Quando exporto as fotos pelo lightroom Web, este problema não acontece.

When I export a photo from my Lightroom app to the Computer, it appears too dark.
Situation that has never happened so far!

In what application are you viewing the exported image?

Did you recently upgrade to Windows 11?