diff --git a/source/net/sourceforge/filebot/MediaTypes.java b/source/net/sourceforge/filebot/MediaTypes.java
index 5854c35f..c1bfff72 100644
--- a/source/net/sourceforge/filebot/MediaTypes.java
+++ b/source/net/sourceforge/filebot/MediaTypes.java
@@ -18,7 +18,14 @@ import org.w3c.dom.Node;
 
 public class MediaTypes {
 
-	private static final MediaTypes defaultInstance = parseDefault();
+	private static MediaTypes defaultInstance;
+
+	public static synchronized MediaTypes getDefault() {
+		if (defaultInstance == null) {
+			defaultInstance = parseDefault();
+		}
+		return defaultInstance;
+	}
 
 	private static MediaTypes parseDefault() {
 		try {
@@ -70,10 +77,6 @@ public class MediaTypes {
 		return filter;
 	}
 
-	public static MediaTypes getDefault() {
-		return defaultInstance;
-	}
-
 	public Map<String, List<String>> getTypes() {
 		return types;
 	}
@@ -88,13 +91,15 @@ public class MediaTypes {
 	}
 
 	public static ExtensionFileFilter getDefaultFilter(String name) {
-		return defaultInstance.getFilter(name);
+		return getDefault().getFilter(name);
 	}
 
 	// some convenience filters
 	public static final ExtensionFileFilter AUDIO_FILES = getDefaultFilter("audio");
 	public static final ExtensionFileFilter VIDEO_FILES = getDefaultFilter("video");
 	public static final ExtensionFileFilter SUBTITLE_FILES = getDefaultFilter("subtitle");
+	public static final ExtensionFileFilter ARCHIVE_FILES = getDefaultFilter("archive");
+	public static final ExtensionFileFilter VERIFICATION_FILES = getDefaultFilter("verification");
 	public static final ExtensionFileFilter NFO_FILES = getDefaultFilter("application/nfo");
 	public static final ExtensionFileFilter LIST_FILES = getDefaultFilter("application/list");
 }
diff --git a/source/net/sourceforge/filebot/cli/ScriptShellBaseClass.java b/source/net/sourceforge/filebot/cli/ScriptShellBaseClass.java
index b9e70643..2e9d5b53 100644
--- a/source/net/sourceforge/filebot/cli/ScriptShellBaseClass.java
+++ b/source/net/sourceforge/filebot/cli/ScriptShellBaseClass.java
@@ -1,6 +1,5 @@
 package net.sourceforge.filebot.cli;
 
-import static java.util.Collections.*;
 import static net.sourceforge.filebot.Settings.*;
 import static net.sourceforge.filebot.cli.CLILogging.*;
 import groovy.lang.Closure;
@@ -8,10 +7,6 @@ import groovy.lang.MissingPropertyException;
 import groovy.lang.Script;
 
 import java.io.Console;
-import java.io.File;
-import java.nio.file.Path;
-import java.util.ArrayList;
-import java.util.List;
 import java.util.Map;
 import java.util.logging.Logger;
 
@@ -20,6 +15,7 @@ import javax.script.SimpleBindings;
 
 import net.sourceforge.filebot.MediaTypes;
 import net.sourceforge.filebot.format.AssociativeScriptObject;
+import net.sourceforge.filebot.util.FileUtilities;
 
 public abstract class ScriptShellBaseClass extends Script {
 
@@ -27,6 +23,31 @@ public abstract class ScriptShellBaseClass extends Script {
 		System.out.println(this);
 	}
 
+	private Map<String, ?> defaultValues;
+
+	public void setDefaultValues(Map<String, ?> values) {
+		this.defaultValues = values;
+	}
+
+	public Map<String, ?> getDefaultValues() {
+		return defaultValues;
+	}
+
+	@Override
+	public Object getProperty(String property) {
+		try {
+			return super.getProperty(property);
+		} catch (MissingPropertyException e) {
+			// try user-defined default values
+			if (defaultValues != null && defaultValues.containsKey(property)) {
+				return defaultValues.get(property);
+			}
+
+			// can't use default value, rethrow exception
+			throw e;
+		}
+	}
+
 	public void include(String input) throws Throwable {
 		try {
 			executeScript(input, null);
@@ -47,38 +68,13 @@ public abstract class ScriptShellBaseClass extends Script {
 		if (bindings != null) {
 			parameters.putAll(bindings);
 		}
-		parameters.put(ScriptShell.ARGV_BINDING_NAME, asFileList(args));
+		parameters.put(ScriptShell.ARGV_BINDING_NAME, FileUtilities.asFileList(args));
 
 		// run given script
 		ScriptShell shell = (ScriptShell) getBinding().getVariable(ScriptShell.SHELL_BINDING_NAME);
 		return shell.runScript(input, parameters);
 	}
 
-	private Map<String, ?> defaultValues;
-
-	public void setDefaultValues(Map<String, ?> values) {
-		this.defaultValues = values;
-	}
-
-	public Map<String, ?> getDefaultValues() {
-		return defaultValues == null ? null : unmodifiableMap(defaultValues);
-	}
-
-	@Override
-	public Object getProperty(String property) {
-		try {
-			return super.getProperty(property);
-		} catch (MissingPropertyException e) {
-			// try user-defined default values
-			if (defaultValues != null && defaultValues.containsKey(property)) {
-				return defaultValues.get(property);
-			}
-
-			// can't use default value, rethrow exception
-			throw e;
-		}
-	}
-
 	public Object tryQuietly(Closure<?> c) {
 		try {
 			return c.call();
@@ -104,11 +100,6 @@ public abstract class ScriptShellBaseClass extends Script {
 		throw new Exception(message);
 	}
 
-	@Override
-	public Object run() {
-		return null;
-	}
-
 	// define global variable: _args
 	public ArgumentBean get_args() {
 		return getApplicationArguments();
@@ -144,18 +135,9 @@ public abstract class ScriptShellBaseClass extends Script {
 		return System.console();
 	}
 
-	public static List<File> asFileList(Object... paths) {
-		List<File> files = new ArrayList<File>();
-		for (Object it : paths) {
-			if (it instanceof CharSequence) {
-				files.add(new File(it.toString()));
-			} else if (it instanceof File) {
-				files.add((File) it);
-			} else if (it instanceof Path) {
-				files.add(((Path) it).toFile());
-			}
-		}
-		return files;
+	@Override
+	public Object run() {
+		return null;
 	}
 
 }
diff --git a/source/net/sourceforge/filebot/util/FileUtilities.java b/source/net/sourceforge/filebot/util/FileUtilities.java
index eb8602e4..97c9df7c 100644
--- a/source/net/sourceforge/filebot/util/FileUtilities.java
+++ b/source/net/sourceforge/filebot/util/FileUtilities.java
@@ -15,8 +15,10 @@ import java.nio.ByteBuffer;
 import java.nio.channels.FileChannel;
 import java.nio.charset.Charset;
 import java.nio.file.AtomicMoveNotSupportedException;
+import java.nio.file.Path;
 import java.nio.file.StandardCopyOption;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collection;
 import java.util.Comparator;
 import java.util.HashMap;
@@ -395,6 +397,14 @@ public final class FileUtilities {
 		return f;
 	}
 
+	public static List<File> listFiles(File... folders) {
+		return listFiles(Arrays.asList(folders));
+	}
+
+	public static List<File> listFiles(Iterable<File> folders) {
+		return listFiles(folders, 255, false);
+	}
+
 	public static List<File> listFiles(Iterable<File> folders, int maxDepth, boolean listHiddenFiles) {
 		List<File> files = new ArrayList<File>();
 
@@ -539,6 +549,20 @@ public final class FileUtilities {
 		return Pattern.compile("\\s*[\\\\/]+\\s*").matcher(path).replaceAll(replacement);
 	}
 
+	public static List<File> asFileList(Object... paths) {
+		List<File> files = new ArrayList<File>(paths.length);
+		for (Object it : paths) {
+			if (it instanceof CharSequence) {
+				files.add(new File(it.toString()));
+			} else if (it instanceof File) {
+				files.add((File) it);
+			} else if (it instanceof Path) {
+				files.add(((Path) it).toFile());
+			}
+		}
+		return files;
+	}
+
 	public static String getXmlString(Document dom) throws TransformerException {
 		Transformer tr = TransformerFactory.newInstance().newTransformer();
 		tr.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");