Opening a file via Runtime.exec() on Mac OS X

I'm having a hard time opening a file programatically on Mac OS X.
The following code works only if the filepath/filename doesn't contain a space:
String filepath;
Runtime rt = Runtime.getRuntime();
rt.exec( "open " + filepath);From a terminal, typing open + surrounding the filepath with either apostrophes or quotes and OS X will open the file no problem, even if it has spaces.
So I tried modifying my call:
filepath = "\"" + filepath + "\"";
rt.exec( "open " + filepath);...then nothing happens. No error, no popup, no exception thrown...nothing. Same thing if I use apostrophes vice quotes.
Any ideas? I'm using JDK 5.0 as 6.0 is not yet supported by Apple.
Thanks in advance.

assuming open is an app, not a command within a shell... what about this:
String[] cmd = { "open", filepath }; // with out quotes
rt.exec(cmd);

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-T-

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