windows explorer right click on filews with multiple extensions

Hi there,
thanks once again for your great support.

Today I came across the following problem and tried to google for an answer, but without luck.
In windows explorer, if I select files with different extensions (for example two files, one txt and one pdf) and right click to bring up the context menu, I noticed that the entry "Open" is missing. Instead if I select files with the same extension, the entry "open" is correctly displayed.
What I want to do is to get the "open" command in the context menu even if I select files of different type.
Is there a way to do that without having to write my own shell extension handler?

Thanks for any help that I will get.

Hi there,
I found a solution on my own.
1) Open regedit in HKEY_CLASSES_ROOT\*\shell
2) Add a key call "open all" (or whatever name you like)
3) add a key called "command" to the previous key
4) double click the "default" string and type "rundll32 url.dll,FileProtocolHandler "%1""

Job done!