Open with... a portable app failing with Win 10 ?

Hello,

I guess this issue is related to Windows 10, since I did not notice something similar in Windows 7 or 8.

Example of the issue:
I want to decompress the files example.7z.001, example.7z.002 with 7zip, which are not directly recognized as manageable with 7zip. So I use Open with and I browse for 7-ZipPortable.exe (I also tried the executable in the App folder). But nothing happens.
The program finally opens after a crazy long time (~ 10 min. measured).
If I open manually in 7zip, it is immediate.

The same issue also happens with a much simpler task: opening a small text file with Notepad++.

Is there some solution? Is it a problem specific to Windows 10 or to portable apps?

Many thanks,
Thierry