File lock during exec() use

Question

Hi, thanks for your attention.
I'm having the following problem: (using Java 6 and Windows XP)
I want to open an image tools from my java program, using an image file already existing, during my java program execution.
But when I try to save the edited image on the same file, the image tool cannot do it, apparently because of a file write lock on the original file.
I do not keep any lock or stream open on the file (dont even open the file), and the problem does not happen every time. Can anybody tell my if this is a normal behaviour, and a possible workaround if it exists?
Here is my code
                 java.io.File executable = "c:/windows/system32/mspaint";
                 String order =   executable.getAbsolutePath() + c:/temp/image1.jpg";
                Process proc= Runtime.getRuntime().exec(order,
                        null,executable.getParentFile());
                proc.waitFor();
  // ....

Answer 1

By the way, I have the same problem if I try to use java.awt.Desktop or JDIC to open the file: if I try to save the edited file, I get (almost always, but not always) a "shared access violation" warning, and I cannot save it.
Curious, isn't it?