Thank you for your good advice. Yes, I did that, too. This way the Rar tool extract the its content within this dedicated folder. Yet, I'm afraid that the problems with the desktop.ini might not end there. It's a difficult issue to search for on the internet, because I'm not knowing the true cause of it. I tried various repair tools, but the problem remains...
I lately had problems with the "shortcut virus" (and maybe I removed too much?) which I resolved in this way:
Firstly turn off wscript in task manager. Go to Folder Option > Show hidden files and Unhide all 3 Hide options. Check all drives, incl. drives of USB or storage devices. There you see your original files and hidden files with virus as vbs script file with a strange name. Delete these vbs script files on your drives.
If PC starts with "ShellClass", remove do the following:
Start > Search Desktop > Desktop.ini and delete this file:
Then restart PC...
Alternatively: In CMD paste (depend on drive letter) this:
attrib -h -s -r -a /s /d C:*.*
attrib -h -s -r -a /s /d E:*.*