diff --git a/darwin/stddialogs.m b/darwin/stddialogs.m
index 814456ab..bf9bc192 100644
--- a/darwin/stddialogs.m
+++ b/darwin/stddialogs.m
@@ -32,7 +32,7 @@ static char *runSavePanel(NSWindow *parent, NSSavePanel *s)
 	return filename;
 }
 
-char *uiOpenFile(uiWindow *parent)
+char *uiOpenFile(uiWindow *parent, char* filter)
 {
 	NSOpenPanel *o;
 
@@ -46,7 +46,7 @@ char *uiOpenFile(uiWindow *parent)
 	return runSavePanel(windowWindow(parent), o);
 }
 
-char *uiSaveFile(uiWindow *parent)
+char *uiSaveFile(uiWindow *parent, char* filter)
 {
 	NSSavePanel *s;
 
diff --git a/ui.h b/ui.h
index 40aea949..2eb20067 100644
--- a/ui.h
+++ b/ui.h
@@ -130,7 +130,7 @@ _UI_EXTERN void uiWindowSetBorderless(uiWindow *w, int borderless);
 _UI_EXTERN void uiWindowSetChild(uiWindow *w, uiControl *child);
 _UI_EXTERN int uiWindowMargined(uiWindow *w);
 _UI_EXTERN void uiWindowSetMargined(uiWindow *w, int margined);
-_UI_EXTERN uiWindow *uiNewWindow(const char *title, int width, int height, int hasMenubar);
+_UI_EXTERN uiWindow *uiNewWindow(const char *title, int width, int height, int hasMenubar, int resizable);
 
 typedef struct uiButton uiButton;
 #define uiButton(this) ((uiButton *) (this))
@@ -292,8 +292,8 @@ _UI_EXTERN uiMenuItem *uiMenuAppendAboutItem(uiMenu *m);
 _UI_EXTERN void uiMenuAppendSeparator(uiMenu *m);
 _UI_EXTERN uiMenu *uiNewMenu(const char *name);
 
-_UI_EXTERN char *uiOpenFile(uiWindow *parent);
-_UI_EXTERN char *uiSaveFile(uiWindow *parent);
+_UI_EXTERN char *uiOpenFile(uiWindow *parent, char* filter);
+_UI_EXTERN char *uiSaveFile(uiWindow *parent, char* filter);
 _UI_EXTERN void uiMsgBox(uiWindow *parent, const char *title, const char *description);
 _UI_EXTERN void uiMsgBoxError(uiWindow *parent, const char *title, const char *description);
 
diff --git a/unix/stddialogs.c b/unix/stddialogs.c
index 93302f75..854baacb 100644
--- a/unix/stddialogs.c
+++ b/unix/stddialogs.c
@@ -4,20 +4,58 @@
 // LONGTERM figure out why, and describe, that this is the desired behavior
 // LONGTERM also point out that font and color buttons also work like this
 
-#define windowWindow(w) (GTK_WINDOW(uiControlHandle(uiControl(w))))
+#define windowWindow(w) ((w)?(GTK_WINDOW(uiControlHandle(uiControl(w)))):NULL)
 
-static char *filedialog(GtkWindow *parent, GtkFileChooserAction mode, const gchar *confirm)
+static char *filedialog(GtkWindow *parent, GtkFileChooserAction mode, const gchar *confirm, char* filter)
 {
 	GtkWidget *fcd;
 	GtkFileChooser *fc;
 	gint response;
 	char *filename;
 
+	GtkFileFilter *filter;
+	gchar _filter[256];
+	gchar* fp = &_filter[0];
+	gchar* fname;
+	gchar *j;
+	int i;
+	int s;
+
 	fcd = gtk_file_chooser_dialog_new(NULL, parent, mode,
 		"_Cancel", GTK_RESPONSE_CANCEL,
 		confirm, GTK_RESPONSE_ACCEPT,
 		NULL);
 	fc = GTK_FILE_CHOOSER(fcd);
+
+	for (i = s = 0; i < 255; i++) {
+		if (filter[i] == '|' || filter[i] == '\0') {
+			_filter[i] = '\0';
+			if (s & 1) {
+				filter = gtk_file_filter_new();
+				gtk_file_filter_set_name(filter, fname);
+				for (j = fp; ; j++) {
+					if (*j == ';') {
+						*j = '\0';
+						gtk_file_filter_add_pattern(filter, fp);
+						fp = j + 1;
+					} else if (*j == '\0') {
+						gtk_file_filter_add_pattern(filter, fp);
+						break;
+					}
+				}
+				gtk_file_chooser_add_filter(fc, filter);
+			} else {
+				fname = fp;
+			}
+			fp = &_filter[i + 1];
+			s++;
+			if (s >= 8) break;
+			if (filter[i] == '\0') break;
+		} else {
+			_filter[i] = filter[i];
+		}
+	}
+
 	gtk_file_chooser_set_local_only(fc, FALSE);
 	gtk_file_chooser_set_select_multiple(fc, FALSE);
 	gtk_file_chooser_set_show_hidden(fc, TRUE);
@@ -33,14 +71,14 @@ static char *filedialog(GtkWindow *parent, GtkFileChooserAction mode, const gcha
 	return filename;
 }
 
-char *uiOpenFile(uiWindow *parent)
+char *uiOpenFile(uiWindow *parent, char* filter)
 {
-	return filedialog(windowWindow(parent), GTK_FILE_CHOOSER_ACTION_OPEN, "_Open");
+	return filedialog(windowWindow(parent), GTK_FILE_CHOOSER_ACTION_OPEN, "_Open", filter);
 }
 
-char *uiSaveFile(uiWindow *parent)
+char *uiSaveFile(uiWindow *parent, char* filter)
 {
-	return filedialog(windowWindow(parent), GTK_FILE_CHOOSER_ACTION_SAVE, "_Save");
+	return filedialog(windowWindow(parent), GTK_FILE_CHOOSER_ACTION_SAVE, "_Save", filter);
 }
 
 static void msgbox(GtkWindow *parent, const char *title, const char *description, GtkMessageType type, GtkButtonsType buttons)
diff --git a/unix/window.c b/unix/window.c
index c5ba2038..83841e7b 100644
--- a/unix/window.c
+++ b/unix/window.c
@@ -229,7 +229,7 @@ void uiWindowSetMargined(uiWindow *w, int margined)
 	uiprivSetMargined(w->childHolderContainer, w->margined);
 }
 
-uiWindow *uiNewWindow(const char *title, int width, int height, int hasMenubar)
+uiWindow *uiNewWindow(const char *title, int width, int height, int hasMenubar, int resizable)
 {
 	uiWindow *w;
 
@@ -275,5 +275,7 @@ uiWindow *uiNewWindow(const char *title, int width, int height, int hasMenubar)
 	// TODO we really need to clean this up, especially since see uiWindowDestroy() above
 	g_object_ref(w->widget);
 
+	gtk_window_set_resizable(w->window, resizable?TRUE:FALSE);
+
 	return w;
 }
diff --git a/windows/stddialogs.cpp b/windows/stddialogs.cpp
index c6ac4557..dc349ae2 100644
--- a/windows/stddialogs.cpp
+++ b/windows/stddialogs.cpp
@@ -14,9 +14,9 @@
 // - when a dialog is active, tab navigation in other windows stops working
 // - when adding uiOpenFolder(), use IFileDialog as well - https://msdn.microsoft.com/en-us/library/windows/desktop/bb762115%28v=vs.85%29.aspx
 
-#define windowHWND(w) ((HWND) uiControlHandle(uiControl(w)))
+#define windowHWND(w) (w ? (HWND) uiControlHandle(uiControl(w)) : NULL)
 
-char *commonItemDialog(HWND parent, REFCLSID clsid, REFIID iid, FILEOPENDIALOGOPTIONS optsadd)
+char *commonItemDialog(HWND parent, REFCLSID clsid, REFIID iid, char* filter, FILEOPENDIALOGOPTIONS optsadd)
 {
 	IFileDialog *d = NULL;
 	FILEOPENDIALOGOPTIONS opts;
@@ -25,6 +25,13 @@ char *commonItemDialog(HWND parent, REFCLSID clsid, REFIID iid, FILEOPENDIALOGOP
 	char *name = NULL;
 	HRESULT hr;
 
+	COMDLG_FILTERSPEC filterspec[8];
+	wchar_t _filter[256];
+	wchar_t* fp = &_filter[0];
+	wchar_t* fname;
+	int i;
+	int s = 0;
+
 	hr = CoCreateInstance(clsid,
 		NULL, CLSCTX_INPROC_SERVER,
 		iid, (LPVOID *) (&d));
@@ -46,6 +53,26 @@ char *commonItemDialog(HWND parent, REFCLSID clsid, REFIID iid, FILEOPENDIALOGOP
 		logHRESULT(L"error setting options", hr);
 		goto out;
 	}
+
+	for (i = s = 0; i < 255; i++) {
+		if (filter[i] == '|' || filter[i] == '\0') {
+			_filter[i] = '\0';
+			if (s & 1) {
+				filterspec[s>>1].pszName = fname;
+				filterspec[s>>1].pszSpec = fp;
+			} else {
+				fname = fp;
+			}
+			fp = &_filter[i + 1];
+			s++;
+			if (s >= 8) break;
+			if (filter[i] == '\0') break;
+		} else {
+			_filter[i] = filter[i];
+		}
+	}
+	d->SetFileTypes(s >> 1, filterspec);
+
 	hr = d->Show(parent);
 	if (hr == HRESULT_FROM_WIN32(ERROR_CANCELLED))
 		// cancelled; return NULL like we have ready
@@ -76,26 +103,28 @@ out:
 	return name;
 }
 
-char *uiOpenFile(uiWindow *parent)
+char *uiOpenFile(uiWindow *parent, char* filter)
 {
 	char *res;
 
 	disableAllWindowsExcept(parent);
 	res = commonItemDialog(windowHWND(parent),
 		CLSID_FileOpenDialog, IID_IFileOpenDialog,
-		FOS_NOCHANGEDIR | FOS_ALLNONSTORAGEITEMS | FOS_NOVALIDATE | FOS_PATHMUSTEXIST | FOS_FILEMUSTEXIST | FOS_SHAREAWARE | FOS_NOTESTFILECREATE | FOS_NODEREFERENCELINKS | FOS_FORCESHOWHIDDEN | FOS_DEFAULTNOMINIMODE);
+		filter,
+		FOS_NOCHANGEDIR | FOS_FORCEFILESYSTEM | FOS_NOVALIDATE | FOS_PATHMUSTEXIST | FOS_FILEMUSTEXIST | FOS_SHAREAWARE | FOS_NOTESTFILECREATE | FOS_FORCESHOWHIDDEN | FOS_DEFAULTNOMINIMODE);
 	enableAllWindowsExcept(parent);
 	return res;
 }
 
-char *uiSaveFile(uiWindow *parent)
+char *uiSaveFile(uiWindow *parent, char* filter)
 {
 	char *res;
 
 	disableAllWindowsExcept(parent);
 	res = commonItemDialog(windowHWND(parent),
 		CLSID_FileSaveDialog, IID_IFileSaveDialog,
-		FOS_OVERWRITEPROMPT | FOS_NOCHANGEDIR | FOS_ALLNONSTORAGEITEMS | FOS_NOVALIDATE | FOS_SHAREAWARE | FOS_NOTESTFILECREATE | FOS_NODEREFERENCELINKS | FOS_FORCESHOWHIDDEN | FOS_DEFAULTNOMINIMODE);
+		filter,
+		FOS_OVERWRITEPROMPT | FOS_NOCHANGEDIR | FOS_FORCEFILESYSTEM | FOS_NOVALIDATE | FOS_SHAREAWARE | FOS_NOTESTFILECREATE | FOS_FORCESHOWHIDDEN | FOS_DEFAULTNOMINIMODE);
 	enableAllWindowsExcept(parent);
 	return res;
 }
diff --git a/windows/window.cpp b/windows/window.cpp
index 2ea5b7ce..ef2933a2 100644
--- a/windows/window.cpp
+++ b/windows/window.cpp
@@ -452,7 +452,7 @@ static void setClientSize(uiWindow *w, int width, int height, BOOL hasMenubar, D
 		logLastError(L"error resizing window");
 }
 
-uiWindow *uiNewWindow(const char *title, int width, int height, int hasMenubar)
+uiWindow *uiNewWindow(const char *title, int width, int height, int hasMenubar, int resizable)
 {
 	uiWindow *w;
 	WCHAR *wtitle;
@@ -465,8 +465,11 @@ uiWindow *uiNewWindow(const char *title, int width, int height, int hasMenubar)
 		hasMenubarBOOL = TRUE;
 	w->hasMenubar = hasMenubarBOOL;
 
-#define style WS_OVERLAPPEDWINDOW
-#define exstyle 0
+	int style = WS_OVERLAPPEDWINDOW;
+	int exstyle = 0;
+
+	if (!resizable)
+		style &= ~(WS_THICKFRAME | WS_MAXIMIZEBOX);
 
 	wtitle = toUTF16(title);
 	w->hwnd = CreateWindowExW(exstyle,