diff --git a/src/select/files/SelectDialog.java b/src/select/files/SelectDialog.java
index 7db3b09..80d0c69 100644
--- a/src/select/files/SelectDialog.java
+++ b/src/select/files/SelectDialog.java
@@ -72,12 +72,14 @@ public class SelectDialog extends Dialog {
   public static final String EX_PATH_RESULT = "pathResult";
   public static final String EX_CALLBACK = "selectCallback";
   public static final String EX_TITLE = "selectTitle";
+  public static final String EX_EXTENSION = "extension";
 
 
   private String currentPath = "";
   private ArrayAdapter<FileItem> simpleAdapter = null;
 
   private SelectMode selectMode = null;
+  private String extension = null;
   private final Intent intent;
   private PApplet parent;
 
@@ -117,6 +119,8 @@ public void onItemClick(AdapterView parent, View v, int position, long id) {
     selectMode = SelectMode.createSelectMode(getIntent().getIntExtra(EX_STYLE, SelectMode.SELECT_FILE), this);
     selectMode.updateUI();
 
+    extension = getIntent().getStringExtra(EX_EXTENSION);
+
     File f = new File(currentPath);
 
     simpleAdapter = new ArrayAdapter<FileItem>(getContext(), android.R.layout.simple_list_item_2, android.R.id.text1) {
@@ -153,7 +157,21 @@ void updateCurrentList(File f) {
     currentPath = f.getAbsolutePath();
     simpleAdapter.clear();
     for (FileItem item : newData) {
-      simpleAdapter.add(item);
+      if (extension == null) { // no extension filtering
+        simpleAdapter.add(item);
+      } else {
+        if (item.getFile().isDirectory()) { // display folders
+          simpleAdapter.add(item);
+        } else {
+          String name = item.getName();
+          String[] ss = name.split("\\.");
+          String ext = ss[ss.length - 1];
+          if (ext.equals(extension)) { // display file matching extension given
+            simpleAdapter.add(item);
+          }
+
+        }
+      }
     }
     simpleAdapter.notifyDataSetChanged();
   }
diff --git a/src/select/files/SelectLibrary.java b/src/select/files/SelectLibrary.java
index f18c57e..1195c4d 100644
--- a/src/select/files/SelectLibrary.java
+++ b/src/select/files/SelectLibrary.java
@@ -68,7 +68,7 @@ public SelectLibrary(PApplet parent) {
    * @param callback name of the method to be called when the selection is made
    */  
   public void selectInput(String prompt, String callback) {
-    selectImpl(prompt, callback, null, SelectMode.SELECT_FILE);
+    selectImpl(prompt, callback, null, null, SelectMode.SELECT_FILE);
   }
 
   /**
@@ -79,7 +79,7 @@ public void selectInput(String prompt, String callback) {
    * @param callback name of the method to be called when the selection is made
    */
   public void selectOutput(String prompt, String callback) {
-    selectImpl(prompt, callback, null, SelectMode.SAVE_FILE);
+    selectImpl(prompt, callback, null, null, SelectMode.SAVE_FILE);
   }
   
   /**
@@ -90,9 +90,61 @@ public void selectOutput(String prompt, String callback) {
    * @param callback name of the method to be called when the selection is made
    */
   public void selectFolder(String prompt, String callback) {
-    selectImpl(prompt, callback, null, SelectMode.SELECT_FOLDER);
+    selectImpl(prompt, callback, null, null, SelectMode.SELECT_FOLDER);
   }
 
+  /**
+   * Select input with a specific path
+   * See selectInput() for details.
+   *
+   * @webref input:files
+   * @param prompt
+   *            message to the user
+   * @param callback
+   *            name of the method to be called when the selection is made
+   * @param path
+   *        a java File object with the specific path 
+   */
+  public void customInput(String prompt, String callback, File path) {
+    selectImpl(prompt, callback, path, null, SelectMode.SELECT_FILE);
+  }
+  
+  /**
+   * See customInput() for details.
+   *
+   * @webref output:files
+   * @param prompt
+   *            message to the user
+   * @param callback
+   *            name of the method to be called when the selection is made
+   * @param path
+   *        a java File object with the specific path 
+   */
+  public void customOutput(String prompt, String callback, File path) {
+    selectImpl(prompt, callback, path, null, SelectMode.SAVE_FILE);
+  }
+  
+  
+  /**
+   * Filtering result with an extension name
+   * See selectInput() for details.
+   *
+   * @webref input:files
+   * @param prompt
+   *            message to the user
+   * @param callback
+   *            name of the method to be called when the selection is made
+   * @param path
+   *        java File object with the specific path 
+   * @param extension
+   *        string for instance "mp3" or "csv".
+   */
+  public void filteredInput(String prompt, String callback, File path,
+      String extension) {
+    selectImpl(prompt, callback, path, extension, SelectMode.SELECT_FILE);
+  }
+
+
   /**
    * Starts open/save dialog.
    *  
@@ -104,6 +156,7 @@ public void selectFolder(String prompt, String callback) {
   protected void selectImpl(final String prompt,
                                    final String callbackMethod,
                                    File defaultSelection,
+                                   final String ext,
                                    final int mode) {
     if (defaultSelection == null) {
       defaultSelection = Environment.getExternalStorageDirectory();
@@ -113,6 +166,7 @@ protected void selectImpl(final String prompt,
     i.putExtra(SelectDialog.EX_PATH, defaultSelection.getAbsolutePath());
     i.putExtra(SelectDialog.EX_STYLE, mode);
     i.putExtra(SelectDialog.EX_CALLBACK, callbackMethod);
+    i.putExtra(SelectDialog.EX_EXTENSION, ext);
     i.putExtra(SelectDialog.EX_TITLE, prompt);
     
     parent.runOnUiThread(new Runnable() {