Reduce warnings.

src/com/webcodepro/applecommander/compiler/CompileException.java

@@ -24,6 +24,9 @@ package com.webcodepro.applecommander.compiler;
  * @author Rob
  */
 public class CompileException extends Exception {
+
+	private static final long serialVersionUID = 0xFFFFFFFF80000000L;
+
 	/**
 	 * Create a CompileException. 
 	 */

src/com/webcodepro/applecommander/storage/DiskFullException.java

@@ -27,6 +27,9 @@ package com.webcodepro.applecommander.storage;
  * @author Rob Greene
  */
 public class DiskFullException extends Exception {
+
+	private static final long serialVersionUID = 0xFFFFFFFF80000000L;
+
 	/**
 	 * Constructor for DiskFullException.
 	 */

src/com/webcodepro/applecommander/storage/os/prodos/ProdosDiskSizeDoesNotMatchException.java

@@ -31,6 +31,9 @@ import com.webcodepro.applecommander.storage.DiskFullException;
  * @author Rob Greene
  */
 public class ProdosDiskSizeDoesNotMatchException extends DiskFullException {
+
+	private static final long serialVersionUID = 0xFFFFFFFF80000000L;
+
 	/**
 	 * Constructor for ProdosDiskSizeDoesNotMatchException.
 	 */

src/com/webcodepro/applecommander/util/Host.java

@@ -44,7 +44,10 @@ public class Host {
 		if (macOSX) {
 			prefDir = userHome + "/Library/Preferences/";
 		}
-		else if (linux){
+		else if (linux) {
+			prefDir = "";
+		}
+		else if (windows) {
 			prefDir = "";
 		}
 		else {