matthiasblaesing commented on code in PR #6585:
URL: https://github.com/apache/netbeans/pull/6585#discussion_r1365693319


##########
ide/extbrowser/src/org/netbeans/modules/extbrowser/NbDdeBrowserImpl.java:
##########
@@ -127,6 +132,169 @@ public NbDdeBrowserImpl (ExtWebBrowser extBrowserFactory) 
{
      */
     public static native String getDefaultOpenCommand() throws 
NbBrowserException;
     
+    /**
+     * Get the default browser name using java
+     * part of the solution source 
https://stackoverflow.com/questions/62289/read-write-to-windows-registry-using-java
+     * @return 
+     */
+    private static String getDefaultWindowsBrowser()
+    {
+        try
+        {
+            Process process = Runtime.getRuntime().exec("reg query 
HKEY_CURRENT_USER\\SOFTWARE\\Microsoft\\Windows\\Shell\\Associations\\URLAssociations\\https\\UserChoice
 /f ProgId /v");

Review Comment:
   JNA stands for ["Java Native 
Access"](https://github.com/java-native-access/jna). It allows a Java programm 
to call functions provided by native libraries. JNA consists of two main parts: 
JNA itself provides the glue layer from Java to native and JNA platform 
contains bindings for several libraries.
   For the registry access the library in question is `Advapi32.dll`, this 
library provides `RegQueryValueEx` to access the registry values. JNA platform 
adds some memory handling and error detection and exposes that as 
`registryGetStringValue`.
   Here is a unittest excercising the registry APIs: 
https://github.com/java-native-access/jna/blob/master/contrib/platform/test/com/sun/jna/platform/win32/Advapi32UtilTest.java#L420-L427



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