diff --git a/src/main/java/com/threerings/getdown/launcher/GetdownApp.java b/src/main/java/com/threerings/getdown/launcher/GetdownApp.java
index d25d4cb..8cd431f 100644
--- a/src/main/java/com/threerings/getdown/launcher/GetdownApp.java
+++ b/src/main/java/com/threerings/getdown/launcher/GetdownApp.java
@@ -196,8 +196,8 @@ public class GetdownApp
             protected void showDocument (String url) {
                 String[] cmdarray;
                 if (RunAnywhere.isWindows()) {
-                    String osName = System.getProperty("os.name");
-                    if (osName != null && (osName.indexOf("9") != -1 || osName.indexOf("Me") != -1)) {
+                    String osName = System.getProperty("os.name", "");
+                    if (osName.indexOf("9") != -1 || osName.indexOf("Me") != -1) {
                         cmdarray = new String[] {
                             "command.com", "/c", "start", "\"" + url + "\"" };
                     } else {
diff --git a/src/main/java/com/threerings/getdown/util/FileUtil.java b/src/main/java/com/threerings/getdown/util/FileUtil.java
index 9d6f2ef..f0ebb57 100644
--- a/src/main/java/com/threerings/getdown/util/FileUtil.java
+++ b/src/main/java/com/threerings/getdown/util/FileUtil.java
@@ -188,19 +188,16 @@ public class FileUtil
     public static void walkTree (File root, Visitor visitor)
     {
         File[] children = root.listFiles();
-        if (children != null) {
-            Deque<File> stack = new ArrayDeque<>(Arrays.asList(children));
-            while (!stack.isEmpty()) {
-                File currentFile = stack.pop();
-                if (currentFile.exists()) {
-                    visitor.visit(currentFile);
-                    if (currentFile.isDirectory()) {
-                        File[] currentChildren = currentFile.listFiles();
-                        if (currentChildren != null) {
-                            for (File file : currentChildren) {
-                                stack.push(file);
-                            }
-                        }
+        if (children == null) return;
+        Deque<File> stack = new ArrayDeque<>(Arrays.asList(children));
+        while (!stack.isEmpty()) {
+            File currentFile = stack.pop();
+            if (currentFile.exists()) {
+                visitor.visit(currentFile);
+                File[] currentChildren = currentFile.listFiles();
+                if (currentChildren != null) {
+                    for (File file : currentChildren) {
+                        stack.push(file);
                     }
                 }
             }
diff --git a/src/main/java/com/threerings/getdown/util/LaunchUtil.java b/src/main/java/com/threerings/getdown/util/LaunchUtil.java
index 8c6efc7..720515a 100644
--- a/src/main/java/com/threerings/getdown/util/LaunchUtil.java
+++ b/src/main/java/com/threerings/getdown/util/LaunchUtil.java
@@ -182,13 +182,8 @@ public class LaunchUtil
      */
     public static boolean mustMonitorChildren ()
     {
-        String osname = System.getProperty("os.name");
-        if (osname != null) {
-            osname = osname.toLowerCase();
-            return (osname.indexOf("windows 98") != -1 || osname.indexOf("windows me") != -1);
-        } else {
-            return false;
-        }
+        String osname = System.getProperty("os.name", "").toLowerCase();
+        return (osname.indexOf("windows 98") != -1 || osname.indexOf("windows me") != -1);
     }
 
     /**