Question

Background

I stumbled upon an old applet of mine which is extremely outdated (parts of it from 2001), and I would really like to bring it back from the dead! The applet should open a file in its native application (among other things), but this doesn’t work on the latest Windows versions (including Windows 7), it works well on Windows XP.

        try {
                if (Class.forName("com.ms.security.PolicyEngine") != null) {
                    PolicyEngine.assertPermission(PermissionID.EXEC);
                    PolicyEngine.assertPermission(PermissionID.FILEIO);
                    PolicyEngine.assertPermission(PermissionID.NETIO);
                    PolicyEngine.assertPermission(PermissionID.UI);
                    PolicyEngine.assertPermission(PermissionID.USERFILEIO);
                    PolicyEngine.assertPermission(PermissionID.CLIENTSTORE);
                } 
                else {
                } 
         } catch (Throwable e) {
         }

Problem/Solution

I am pretty sure that the above code has something to do with it. Is it as easy as just removing this code completely and then re-signing the applet? Or do I need to re-implement it with the java.security package instead before signing it? If I need to re-implement it with java.security, is it enough just using something similar:

       try {
                if (Class.forName("java.security.Policy") != null) {            
                    final Permissions permissions = new Permissions();
                    permissions.add( new java.security.AllPermission());
                    } 
                else {
                }                 
        } catch (Throwable e) {
        }

What do I need to make it work on Windows 7?

The applet is using Java version 1.5.0 (J2SE 5.0).

.

Cheers.

UPDATE

Here is the code that works in Windows XP, but does not seem to execute in Windows 7.

    String command = '"' + sDir + sFileName + '"';
    Runtime myRuntime = Runtime.getRuntime();
    try {
        myRuntime.exec("rundll32 SHELL32.DLL,ShellExec_RunDLL " + command);
        gGfx.setStatusText("File opened.");
        gGfx.drawStatusBar(1);
    } catch (IOException e) {

        System.out.println("Error " + e.getMessage());
    }

Answer 1

Is it as easy as just removing this code completely and then re-signing the applet?

That is the solution here.