"Open With" dialog when getRuntime().exec fails

Question

Hi,
I have a program that I use to open media with the associated program on the client machine.
Process p = Runtime.getRuntime().exec("rundll32 SHELL32.DLL,ShellExec_RunDLL " + file);
But when there is no associated program with the file extension I want to open the "Open With" dialog on the client machine.
Process p = Runtime.getRuntime().exec("rundll32 SHELL32.DLL,OpenAs_RunDLL " + file);
How do I intercept and not show the error dialog appearing when getRuntime().exec can't open the file, so I can run the command above instead?
Best Regards,
Anders

Answer 1

I tried
Process p = Runtime.getRuntime().exec("start rundll32 SHELL32.DLL,ShellExec_RunDLL " + file);
got exception
java.io.IOException: CreateProcess: start rundll32.exe SHELL32.DLL,ShellExec_RunDLL C:/JBuilder9/doc/Productivity User Manual.pdf error=2
     at java.lang.Win32Process.create(Native Method)
     at java.lang.Win32Process.<init>(Win32Process.java:63)
     at java.lang.Runtime.execInternal(Native Method)
     at java.lang.Runtime.exec(Runtime.java:566)
     at java.lang.Runtime.exec(Runtime.java:428)
     at java.lang.Runtime.exec(Runtime.java:364)
     at java.lang.Runtime.exec(Runtime.java:326)
     at BrowserControl.displayURL(BrowserControl.java:47)
     at BrowserControl.main(BrowserControl.java:123)