diff -up fltk-1.3.0/FL/Fl_Window.H.icons fltk-1.3.0/FL/Fl_Window.H
--- fltk-1.3.0/FL/Fl_Window.H.icons	2012-03-26 13:59:54.999248350 +0200
+++ fltk-1.3.0/FL/Fl_Window.H	2012-03-26 15:19:30.298051647 +0200
@@ -31,6 +31,10 @@
 #ifndef Fl_Window_H
 #define Fl_Window_H
 
+#ifdef WIN32
+#include <windows.h>
+#endif
+
 #include "Fl_Group.H"
 
 #define FL_WINDOW 0xF0		///< window type id all subclasses have type() >= this
@@ -63,9 +67,19 @@ class FL_EXPORT Fl_Window : public Fl_Gr
   friend class Fl_X;
   Fl_X *i; // points at the system-specific stuff
 
+  struct icon_data {
+    const void *legacy_icon;
+    Fl_RGB_Image **icons;
+    int count;
+#ifdef WIN32
+    HICON big_icon;
+    HICON small_icon;
+#endif
+  };
+
   const char* iconlabel_;
   char* xclass_;
-  const void* icon_;
+  struct icon_data *icon_;
   // size_range stuff:
   int minw, minh, maxw, maxh;
   int dw, dh, aspect;
@@ -110,6 +124,8 @@ protected:
   */
   int force_position() const { return ((flags() & FORCE_POSITION)?1:0); }
 
+  void free_icons();
+
 public:
 
   /**
@@ -331,6 +347,18 @@ public:
   static const char *default_xclass();
   const char* xclass() const;
   void xclass(const char* c);
+
+  static void default_icon(const Fl_RGB_Image*);
+  static void default_icons(const Fl_RGB_Image*[], int);
+  void icon(const Fl_RGB_Image*);
+  void icons(const Fl_RGB_Image*[], int);
+
+#ifdef WIN32
+  static void default_icons(HICON big_icon, HICON small_icon);
+  void icons(HICON big_icon, HICON small_icon);
+#endif
+
+  /* for legacy compatibility */
   const void* icon() const;
   void icon(const void * ic);
 
diff -up fltk-1.3.0/FL/mac.H.icons fltk-1.3.0/FL/mac.H
--- fltk-1.3.0/FL/mac.H.icons	2012-03-26 13:59:55.000248332 +0200
+++ fltk-1.3.0/FL/mac.H	2012-03-26 13:59:55.030247798 +0200
@@ -141,6 +141,9 @@ public:
   void collapse(void);
   WindowRef window_ref(void);
   void set_key_window(void);
+  // OS X doesn't have per window icons
+  static void set_default_icons(const Fl_RGB_Image*[], int) {};
+  void set_icons() {};
   int set_cursor(Fl_Cursor);
   int set_cursor(const Fl_RGB_Image*, int, int);
   static CGImageRef CGImage_from_window_rect(Fl_Window *win, int x, int y, int w, int h);
diff -up fltk-1.3.0/FL/win32.H.icons fltk-1.3.0/FL/win32.H
--- fltk-1.3.0/FL/win32.H.icons	2012-03-26 14:00:45.329351820 +0200
+++ fltk-1.3.0/FL/win32.H	2012-03-26 15:11:07.822005705 +0200
@@ -93,6 +93,9 @@ public:
   void flush() {w->flush();}
   void set_minmax(LPMINMAXINFO minmax);
   void mapraise();
+  static void set_default_icons(const Fl_RGB_Image*[], int);
+  static void set_default_icons(HICON, HICON);
+  void set_icons();
   int set_cursor(Fl_Cursor);
   int set_cursor(const Fl_RGB_Image*, int, int);
   static Fl_X* make(Fl_Window*);
diff -up fltk-1.3.0/FL/x.H.icons fltk-1.3.0/FL/x.H
--- fltk-1.3.0/FL/x.H.icons	2012-03-26 13:59:55.000248332 +0200
+++ fltk-1.3.0/FL/x.H	2012-03-26 13:59:55.031247780 +0200
@@ -163,6 +163,8 @@ public:
   static Fl_X* i(const Fl_Window* wi) {return wi->i;}
   void setwindow(Fl_Window* wi) {w=wi; wi->i=this;}
   void sendxjunk();
+  static void set_default_icons(const Fl_RGB_Image*[], int);
+  void set_icons();
   int set_cursor(Fl_Cursor);
   int set_cursor(const Fl_RGB_Image*, int, int);
   static void make_xid(Fl_Window*,XVisualInfo* =fl_visual, Colormap=fl_colormap);
diff -up fltk-1.3.0/src/Fl.cxx.icons fltk-1.3.0/src/Fl.cxx
--- fltk-1.3.0/src/Fl.cxx.icons	2012-03-26 13:59:54.966248938 +0200
+++ fltk-1.3.0/src/Fl.cxx	2012-03-26 13:59:55.031247780 +0200
@@ -1535,6 +1535,8 @@ Fl_Window::~Fl_Window() {
   if (xclass_) {
     free(xclass_);
   }
+  free_icons();
+  delete icon_;
 }
 
 // FL_SHOW and FL_HIDE are called whenever the visibility of this widget
diff -up fltk-1.3.0/src/Fl_win32.cxx.icons fltk-1.3.0/src/Fl_win32.cxx
--- fltk-1.3.0/src/Fl_win32.cxx.icons	2012-03-26 14:01:34.520475576 +0200
+++ fltk-1.3.0/src/Fl_win32.cxx	2012-03-26 15:13:12.566782769 +0200
@@ -1806,6 +1806,8 @@ Fl_X* Fl_X::make(Fl_Window* w) {
   );
   if (lab) free(lab);
 
+  x->set_icons();
+
   if (w->flags() & Fl_Widget::FULLSCREEN) {
   /* We need to make sure that the fullscreen is created on the
      default monitor, ie the desktop where the shortcut is located
@@ -2036,71 +2038,19 @@ void Fl_Window::label(const char *name,c
 
 ////////////////////////////////////////////////////////////////
 
-#ifndef IDC_HAND
-#  define IDC_HAND  MAKEINTRESOURCE(32649)
-#endif // !IDC_HAND
-
-int Fl_X::set_cursor(Fl_Cursor c) {
-  LPSTR n;
-  HCURSOR new_cursor;
-
-  if (c == FL_CURSOR_NONE)
-    new_cursor = NULL;
-  else {
-    switch (c) {
-    case FL_CURSOR_ARROW:   n = IDC_ARROW; break;
-    case FL_CURSOR_CROSS:   n = IDC_CROSS; break;
-    case FL_CURSOR_WAIT:    n = IDC_WAIT; break;
-    case FL_CURSOR_INSERT:  n = IDC_IBEAM; break;
-    case FL_CURSOR_HAND:    n = IDC_HAND; break;
-    case FL_CURSOR_HELP:    n = IDC_HELP; break;
-    case FL_CURSOR_MOVE:    n = IDC_SIZEALL; break;
-    case FL_CURSOR_N:
-    case FL_CURSOR_S:
-      // FIXME: Should probably have fallbacks for these instead
-    case FL_CURSOR_NS:      n = IDC_SIZENS; break;
-    case FL_CURSOR_NE:
-    case FL_CURSOR_SW:
-      // FIXME: Dito.
-    case FL_CURSOR_NESW:    n = IDC_SIZENESW; break;
-    case FL_CURSOR_E:
-    case FL_CURSOR_W:
-      // FIXME: Dito.
-    case FL_CURSOR_WE:      n = IDC_SIZEWE; break;
-    case FL_CURSOR_SE:
-    case FL_CURSOR_NW:
-      // FIXME: Dito.
-    case FL_CURSOR_NWSE:    n = IDC_SIZENWSE; break;
-    default:
-      return 0;
-    }
-
-    new_cursor = LoadCursor(NULL, n);
-    if (new_cursor == NULL)
-      return 0;
-  }
-
-  if ((cursor != NULL) && custom_cursor)
-    DestroyIcon(cursor);
-
-  cursor = new_cursor;
-  custom_cursor = 0;
-
-  SetCursor(cursor);
-
-  return 1;
-}
-
-int Fl_X::set_cursor(const Fl_RGB_Image *image, int hotx, int hoty) {
+static HICON image_to_icon(const Fl_RGB_Image *image, bool is_icon=true,
+                           int hotx = 0, int hoty = 0) {
   BITMAPV5HEADER bi;
   HBITMAP bitmap, mask;
   DWORD *bits;
-  HCURSOR new_cursor;
+  HICON icon;
 
-  if ((hotx < 0) || (hotx >= image->w()))
-    return 0;
-  if ((hoty < 0) || (hoty >= image->h()))
-    return 0;
+  if (!is_icon) {
+    if ((hotx < 0) || (hotx >= image->w()))
+      return NULL;
+    if ((hoty < 0) || (hoty >= image->h()))
+      return NULL;
+  }
 
   memset(&bi, 0, sizeof(BITMAPV5HEADER));
 
@@ -2122,7 +2072,7 @@ int Fl_X::set_cursor(const Fl_RGB_Image
   ReleaseDC(NULL, hdc);
 
   if (bits == NULL)
-    return 0;
+    return NULL;
 
   const uchar *i = (const uchar*)*image->data();
   for (int y = 0;y < image->h();y++) {
@@ -2151,22 +2101,206 @@ int Fl_X::set_cursor(const Fl_RGB_Image
   mask = CreateBitmap(image->w(),image->h(),1,1,NULL);
   if (mask == NULL) {
     DeleteObject(bitmap);
-    return 0;
+    return NULL;
   }
 
   ICONINFO ii;
 
-  ii.fIcon    = FALSE;
+  ii.fIcon    = is_icon;
   ii.xHotspot = hotx;
   ii.yHotspot = hoty;
   ii.hbmMask  = mask;
   ii.hbmColor = bitmap;
 
-  new_cursor = CreateIconIndirect(&ii);
+  icon = CreateIconIndirect(&ii);
 
   DeleteObject(bitmap);
   DeleteObject(mask);
 
+  if (icon == NULL)
+    return NULL;
+
+  return icon;
+}
+
+////////////////////////////////////////////////////////////////
+
+static HICON default_big_icon = NULL;
+static HICON default_small_icon = NULL;
+
+const Fl_RGB_Image *find_best_icon(int ideal_width, 
+                                   const Fl_RGB_Image *icons[], int count) {
+  const Fl_RGB_Image *best;
+
+  best = NULL;
+
+  for (int i = 0;i < count;i++) {
+    if (best == NULL)
+      best = icons[i];
+    else {
+      if (best->w() < ideal_width) {
+        if (icons[i]->w() > best->w())
+          best = icons[i];
+      } else {
+        if ((icons[i]->w() >= ideal_width) &&
+            (icons[i]->w() < best->w()))
+          best = icons[i];
+      }
+    }
+  }
+
+  return best;
+}
+
+void Fl_X::set_default_icons(const Fl_RGB_Image *icons[], int count) {
+  const Fl_RGB_Image *best_big, *best_small;
+
+  if (default_big_icon != NULL)
+    DestroyIcon(default_big_icon);
+  if (default_small_icon != NULL)
+    DestroyIcon(default_small_icon);
+
+  best_big = find_best_icon(GetSystemMetrics(SM_CXICON), icons, count);
+  best_small = find_best_icon(GetSystemMetrics(SM_CXSMICON), icons, count);
+
+  if (best_big != NULL)
+    default_big_icon = image_to_icon(best_big);
+  else
+    default_big_icon = NULL;
+
+  if (best_small != NULL)
+    default_small_icon = image_to_icon(best_small);
+  else
+    default_small_icon = NULL;
+}
+
+void Fl_X::set_default_icons(HICON big_icon, HICON small_icon) {
+  if (default_big_icon != NULL)
+    DestroyIcon(default_big_icon);
+  if (default_small_icon != NULL)
+    DestroyIcon(default_small_icon);
+
+  if (big_icon != NULL)
+    default_big_icon = CopyIcon(big_icon);
+  if (small_icon != NULL)
+    default_small_icon = CopyIcon(small_icon);
+}
+
+void Fl_X::set_icons() {
+  HICON big_icon, small_icon;
+
+  big_icon = NULL;
+  small_icon = NULL;
+
+  if (w->icon_->count) {
+    const Fl_RGB_Image *best_big, *best_small;
+
+    best_big = find_best_icon(GetSystemMetrics(SM_CXICON),
+                              (const Fl_RGB_Image **)w->icon_->icons,
+                              w->icon_->count);
+    best_small = find_best_icon(GetSystemMetrics(SM_CXSMICON),
+                                (const Fl_RGB_Image **)w->icon_->icons,
+                                w->icon_->count);
+
+    if (best_big != NULL)
+      big_icon = image_to_icon(best_big);
+    if (best_small != NULL)
+      small_icon = image_to_icon(best_small);
+  } else {
+    big_icon = default_big_icon;
+    small_icon = default_small_icon;
+  }
+
+  if (big_icon != NULL)
+    SendMessage(xid, WM_SETICON, ICON_BIG, (LPARAM)big_icon);
+  if (small_icon != NULL)
+    SendMessage(xid, WM_SETICON, ICON_SMALL, (LPARAM)small_icon);
+
+  if (w->icon_->count) {
+    if (big_icon != NULL)
+      DestroyIcon(big_icon);
+    if (small_icon != NULL)
+      DestroyIcon(small_icon);
+  }
+}
+
+void Fl_Window::default_icons(HICON big_icon, HICON small_icon) {
+  Fl_X::set_default_icons(big_icon, small_icon);
+}
+
+void Fl_Window::icons(HICON big_icon, HICON small_icon) {
+  free_icons();
+
+  if (big_icon != NULL)
+    icon_->big_icon = CopyIcon(big_icon);
+  if (small_icon != NULL)
+    icon_->small_icon = CopyIcon(small_icon);
+
+  if (i)
+    i->set_icons();
+}
+
+////////////////////////////////////////////////////////////////
+
+#ifndef IDC_HAND
+#  define IDC_HAND  MAKEINTRESOURCE(32649)
+#endif // !IDC_HAND
+
+int Fl_X::set_cursor(Fl_Cursor c) {
+  LPSTR n;
+  HCURSOR new_cursor;
+
+  if (c == FL_CURSOR_NONE)
+    new_cursor = NULL;
+  else {
+    switch (c) {
+    case FL_CURSOR_ARROW:   n = IDC_ARROW; break;
+    case FL_CURSOR_CROSS:   n = IDC_CROSS; break;
+    case FL_CURSOR_WAIT:    n = IDC_WAIT; break;
+    case FL_CURSOR_INSERT:  n = IDC_IBEAM; break;
+    case FL_CURSOR_HAND:    n = IDC_HAND; break;
+    case FL_CURSOR_HELP:    n = IDC_HELP; break;
+    case FL_CURSOR_MOVE:    n = IDC_SIZEALL; break;
+    case FL_CURSOR_N:
+    case FL_CURSOR_S:
+      // FIXME: Should probably have fallbacks for these instead
+    case FL_CURSOR_NS:      n = IDC_SIZENS; break;
+    case FL_CURSOR_NE:
+    case FL_CURSOR_SW:
+      // FIXME: Dito.
+    case FL_CURSOR_NESW:    n = IDC_SIZENESW; break;
+    case FL_CURSOR_E:
+    case FL_CURSOR_W:
+      // FIXME: Dito.
+    case FL_CURSOR_WE:      n = IDC_SIZEWE; break;
+    case FL_CURSOR_SE:
+    case FL_CURSOR_NW:
+      // FIXME: Dito.
+    case FL_CURSOR_NWSE:    n = IDC_SIZENWSE; break;
+    default:
+      return 0;
+    }
+
+    new_cursor = LoadCursor(NULL, n);
+    if (new_cursor == NULL)
+      return 0;
+  }
+
+  if ((cursor != NULL) && custom_cursor)
+    DestroyIcon(cursor);
+
+  cursor = new_cursor;
+  custom_cursor = 0;
+
+  SetCursor(cursor);
+
+  return 1;
+}
+
+int Fl_X::set_cursor(const Fl_RGB_Image *image, int hotx, int hoty) {
+  HCURSOR new_cursor;
+
+  new_cursor = image_to_icon(image, false, hotx, hoty);
   if (new_cursor == NULL)
     return 0;
 
diff -up fltk-1.3.0/src/Fl_Window.cxx.icons fltk-1.3.0/src/Fl_Window.cxx
--- fltk-1.3.0/src/Fl_Window.cxx.icons	2012-03-26 13:59:55.007248209 +0200
+++ fltk-1.3.0/src/Fl_Window.cxx	2012-03-26 15:13:05.306912139 +0200
@@ -32,6 +32,7 @@
 #include <config.h>
 #include <FL/Fl.H>
 #include <FL/x.H>
+#include <FL/Fl_RGB_Image.H>
 #include <FL/Fl_Window.H>
 #include <stdlib.h>
 #include "flstring.h"
@@ -54,7 +55,8 @@ void Fl_Window::_Fl_Window() {
   }
   i = 0;
   xclass_ = 0;
-  icon_ = 0;
+  icon_ = new icon_data;
+  memset(icon_, 0, sizeof(*icon_));
   iconlabel_ = 0;
   resizable(0);
   size_range_set = 0;
@@ -277,16 +279,68 @@ const char *Fl_Window::xclass() const
   }
 }
 
+void Fl_Window::default_icon(const Fl_RGB_Image *icon) {
+  default_icons(&icon, 1);
+}
+
+void Fl_Window::default_icons(const Fl_RGB_Image **icons, int count) {
+  Fl_X::set_default_icons(icons, count);
+}
+
+void Fl_Window::icon(const Fl_RGB_Image *icon) {
+  icons(&icon, 1);
+}
+
+void Fl_Window::icons(const Fl_RGB_Image **icons, int count) {
+  free_icons();
+
+  if (count > 0) {
+    icon_->icons = new Fl_RGB_Image*[count];
+    icon_->count = count;
+    // FIXME: Fl_RGB_Image lacks const modifiers on methods
+    for (int i = 0;i < count;i++)
+      icon_->icons[i] = (Fl_RGB_Image*)((Fl_RGB_Image*)icons[i])->copy();
+  }
+
+  if (i)
+    i->set_icons();
+}
+
 /** Gets the current icon window target dependent data. */
 const void *Fl_Window::icon() const {
-  return icon_;
+  return icon_->legacy_icon;
 }
 
 /** Sets the current icon window target dependent data. */
 void Fl_Window::icon(const void * ic) {
-  icon_ = ic;
+  free_icons();
+  icon_->legacy_icon = ic;
 }
 
+void Fl_Window::free_icons() {
+  int i;
+
+  icon_->legacy_icon = 0L;
+
+  if (icon_->icons) {
+    for (i = 0;i < icon_->count;i++)
+      delete icon_->icons[i];
+    delete [] icon_->icons;
+    icon_->icons = 0L;
+  }
+
+  icon_->count = 0;
+
+#ifdef WIN32
+  if (icon_->big_icon)
+    DestroyIcon(icon_->big_icon);
+  if (icon_->small_icon)
+    DestroyIcon(icon_->small_icon);
+
+  icon_->big_icon = NULL;
+  icon_->small_icon = NULL;
+#endif
+}
 
 //
 // End of "$Id: Fl_Window.cxx 8472 2011-02-25 08:44:47Z AlbrechtS $".
diff -up fltk-1.3.0/src/Fl_x.cxx.icons fltk-1.3.0/src/Fl_x.cxx
--- fltk-1.3.0/src/Fl_x.cxx.icons	2012-03-26 13:59:55.028247834 +0200
+++ fltk-1.3.0/src/Fl_x.cxx	2012-03-26 13:59:55.033247744 +0200
@@ -346,6 +346,7 @@ Atom fl_NET_WM_ICON_NAME;		// utf8 aware
 Atom fl_NET_SUPPORTING_WM_CHECK;
 Atom fl_NET_WM_STATE;
 Atom fl_NET_WM_STATE_FULLSCREEN;
+Atom fl_NET_WM_ICON;
 
 /*
   X defines 32-bit-entities to have a format value of max. 32,
@@ -708,6 +709,7 @@ void fl_open_display(Display* d) {
   fl_NET_SUPPORTING_WM_CHECK = XInternAtom(d, "_NET_SUPPORTING_WM_CHECK", 0);
   fl_NET_WM_STATE       = XInternAtom(d, "_NET_WM_STATE",       0);
   fl_NET_WM_STATE_FULLSCREEN = XInternAtom(d, "_NET_WM_STATE_FULLSCREEN", 0);
+  fl_NET_WM_ICON        = XInternAtom(d, "_NET_WM_ICON",        0);
 
   if (sizeof(Atom) < 4)
     atom_bits = sizeof(Atom) * 8;
@@ -2102,12 +2104,14 @@ void Fl_X::make_xid(Fl_Window* win, XVis
       fl_show_iconic = 0;
       showit = 0;
     }
-    if (win->icon()) {
-      hints->icon_pixmap = (Pixmap)win->icon();
+    if (win->icon_->legacy_icon) {
+      hints->icon_pixmap = (Pixmap)win->icon_->legacy_icon;
       hints->flags       |= IconPixmapHint;
     }
     XSetWMHints(fl_display, xp->xid, hints);
     XFree(hints);
+
+    xp->set_icons();
   }
 
   // set the window type for menu and tooltip windows to avoid animations (compiz)
@@ -2226,6 +2230,93 @@ void Fl_Window::size_range_() {
 }
 
 ////////////////////////////////////////////////////////////////
+
+static unsigned long *default_net_wm_icons = 0L;
+static size_t default_net_wm_icons_size = 0;
+
+void icons_to_property(const Fl_RGB_Image *icons[], int count,
+                       unsigned long **property, size_t *len) {
+  size_t sz;
+  unsigned long *data;
+
+  sz = 0;
+  for (int i = 0;i < count;i++)
+    sz += 2 + icons[i]->w() * icons[i]->h();
+
+  // FIXME: Might want to sort the icons
+
+  *property = data = new unsigned long[sz];
+  *len = sz;
+
+  for (int i = 0;i < count;i++) {
+    const Fl_RGB_Image *image;
+
+    image = icons[i];
+
+    data[0] = image->w();
+    data[1] = image->h();
+    data += 2;
+
+    const uchar *in = (const uchar*)*image->data();
+    for (int y = 0;y < image->h();y++) {
+      for (int x = 0;x < image->w();x++) {
+        switch (image->d()) {
+        case 1:
+          *data = ( 0xff<<24) | (in[0]<<16) | (in[0]<<8) | in[0];
+          break;
+        case 2:
+          *data = (in[1]<<24) | (in[0]<<16) | (in[0]<<8) | in[0];
+          break;
+        case 3:
+          *data = ( 0xff<<24) | (in[0]<<16) | (in[1]<<8) | in[2];
+          break;
+        case 4:
+          *data = (in[3]<<24) | (in[0]<<16) | (in[1]<<8) | in[2];
+          break;
+        }
+        in += image->d();
+        data++;
+      }
+      in += image->ld();
+    }
+  }
+}
+
+void Fl_X::set_default_icons(const Fl_RGB_Image *icons[], int count) {
+  if (default_net_wm_icons) {
+    delete [] default_net_wm_icons;
+    default_net_wm_icons = 0L;
+    default_net_wm_icons_size = 0;
+  }
+
+  if (count > 0)
+    icons_to_property(icons, count,
+                      &default_net_wm_icons, &default_net_wm_icons_size);
+}
+
+void Fl_X::set_icons() {
+  unsigned long *net_wm_icons;
+  size_t net_wm_icons_size;
+
+  if (w->icon_->count) {
+    icons_to_property((const Fl_RGB_Image **)w->icon_->icons, w->icon_->count,
+                      &net_wm_icons, &net_wm_icons_size);
+  } else {
+    net_wm_icons = default_net_wm_icons;
+    net_wm_icons_size = default_net_wm_icons_size;
+  }
+
+  XChangeProperty (fl_display, xid, fl_NET_WM_ICON, XA_CARDINAL, 32,
+      PropModeReplace, (unsigned char*) net_wm_icons, net_wm_icons_size);
+
+  if (w->icon_->count) {
+    delete [] net_wm_icons;
+    net_wm_icons = 0L;
+    net_wm_icons_size = 0;
+  }
+}
+
+////////////////////////////////////////////////////////////////
 
 int Fl_X::set_cursor(Fl_Cursor c) {
   unsigned int shape;
