Dear all,
I have already asked you a question, and you kindly have answered fast and solved my problem! thenks so much for doing this.
Now I have another trouble: is it possible to open multiple files in a single instace of an external applicaiton? using shell function I can open one instance for each file to be open... but if I need, for example, to open multiple images with only one instance of my images_viewer.exe? how can I do?
Thanks in advance,
sara.

Check the Application option "make single instance application" and handle the Application Startup/StartupNextInstance events.

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See this thread about how to use forum markup codes for code blocks etc (present the problem/post properly )
Some useful links: Learning videoes, WMI Code Creator, MSDN, The Code Project, WindowsClient.net, ASP.net, W3 Schools, Regular-Expressions.info, GDI+ FAQ

DR. WEIR: Download it to a non-networked, firewalled computer.
TECHNICIAN: Yes, ma'am.