Opening a file via the context-menu of the explorer does not work anymore under Win7 (x64), although the associated entry in the registration for the context-menu:
HKCR\*\shell\Open with jEdit\Command
with the content
"C:\Windows\system32\javaw.exe" -Xmx192M -jar "C:\Program Files\jEdit\jedit.jar" -reuseview "%1"
uses correct paths.

Amazing workaround:
Create the file "C:\Temp\JEditStart.bat" with the line
"C:\Program Files\jEdit\jedit.jar" -reuseview %1
And create a registration key
HKCR\*\shell\Open via JEditStart\Command
with the content
"C:\Temp\JEditStart.bat" "%1"
This will do the job.

My first suspicion was, that the tcp/ip-traffic between the jEdit-client and the server could be causal and be blocked by the windows-firewall. So i allowed "C:\Windows\system32\javaw.exe" for internal and external traffic, but nothing changed.

Any ideas to fix/enable the original context-menu-item "Open with jEdit"?

Thank you!
Hans