I tried the file system permissions, still didnt worked.
What I have done :
I took ownership of the C:\Users\asus\Pictures\Vintagestory file. It seemed I already had all permissions, but I did it anyway :).
I followed this tutorial : https://www.laptopmag.com/articles/take-ownership-folder-windows-10-using-file-explorer
then I rebooted the laptop, tried to take a screenshot in VS, didnt work.
I also tried one more time launching the app with administrator rights, didnt work.
Then I checked another way to manage those file system permissions and I found on Tenforum.com a tutorial which I also followed, and all access are already granted.
Here is a screenshot of where I checked (the File system down below) (I'm using those screens because my OS is not in english)
https://www.tenforums.com/attachments/tutorials/238562d1561654651-allow-deny-apps-access-file-system-windows-10-a-file_system_access_for_apps.jpg?s=73c3a64ce7451fcc828f0e47c967a1e7
Maby I have done something wrong here, I don't know. All permissions seemed to be on, I followed the tutorials.
Let me know if there is another way to check wether it's a file system permissions matter or not. I'm not sure I covered everything, so I'm not sure we can exclude this as beeing the issue at the moment.