"Open with" slows down file context menu when PC in LAN

[Luca]

Hi all!
I have a problem: every time I am connected to the LAN my
Windows Explorer behaves strangely. When I right click a
file (but not a folder) the popup menu takes ages to come
(a minute or more). The same if I select the file and
then try to open the Edit menu. All this happen just if I
am connected to the LAN, if I unplug the LAN cable
everything is normal. I used REGEDIT and tried to find
the problem. I opened
HKEY_CLASSES_ROOT\*\shellex\ContextMenuHandlers and tried
to add "_" at the beginning of the CLSID of one entry at
the time (to disable it). Every time I made this I
checked the behaviour of the Windows Explorer. When I
tried with the "Open with" entry I found that the Windows
Explorer was working normally. So the problem is the
handler of the "Open with" submenu that maybe tries to
find some program in the network, I do not know.
I decided to leave the "_" so that I solved the problem
even if I see the "open with" no more.
Does anyone knows what is the problem and how to really
fix it?
Thank you!

 

[David Candy]

If you add this as a verb you can still access Open With dialog (though no menu)
rundll32.exe shell32.dll,OpenAs_RunDLL "%1"

 

[Luca]

Thank you!