diff --git a/windows/GNUfiles.mk b/windows/GNUfiles.mk
index 3babf0e7..7c5b1b9f 100644
--- a/windows/GNUfiles.mk
+++ b/windows/GNUfiles.mk
@@ -10,7 +10,6 @@ CXXFILES += \
 	windows/box.cpp \
 	windows/button.cpp \
 	windows/checkbox.cpp \
-	windows/child.cpp \
 	windows/combobox.cpp \
 	windows/container.cpp \
 	windows/control.cpp \
diff --git a/windows/child.cpp b/windows/child.cpp
deleted file mode 100644
index 6798df67..00000000
--- a/windows/child.cpp
+++ /dev/null
@@ -1,175 +0,0 @@
-// 28 august 2015
-#include "uipriv_windows.hpp"
-
-// This file contains helpers for managing child controls.
-
-struct child {
-	uiControl *c;
-	HWND hwnd;
-
-	// This is a helper for uiTab pages.
-	// For visual accuracy of tab page backgrounds, margins are also handled here, applied to the child only (rather than applied to the whole tab page).
-	HWND tabpage;
-	int margined;
-
-	// This flag is for users of these functions.
-	// For uiBox, this is "spaced".
-	int flag;
-
-	// These intmax_t variables are for users of these functions.
-	// For uiBox, these are "width" and "height".
-	intmax_t im[2];
-};
-
-struct child *newChild(uiControl *child, uiControl *parent, HWND parentHWND)
-{
-	struct child *c;
-	uiWindowsControl *wc;
-
-	if (child == NULL)
-		return NULL;
-
-	c = uiNew(struct child);
-	c->c = child;
-	c->hwnd = (HWND) uiControlHandle(c->c);
-
-	uiControlSetParent(c->c, parent);
-	wc = uiWindowsControl(c->c);
-	(*(wc->CommitSetParent))(wc, parentHWND);
-
-	return c;
-}
-
-struct child *newChildWithTabPage(uiControl *child, uiControl *parent, HWND parentHWND)
-{
-	struct child *c;
-	HWND tabpage;
-
-	tabpage = newTabPage();
-	c = newChild(child, parent, tabpage);
-	uiWindowsEnsureSetParent(tabpage, parentHWND);
-	c->tabpage = tabpage;
-	return c;
-}
-
-void childRemove(struct child *c)
-{
-	uiWindowsEnsureSetParent(c->hwnd, utilWindow);
-	uiControlSetParent(c->c, NULL);
-	if (c->tabpage != NULL)
-		uiWindowsEnsureDestroyWindow(c->tabpage);
-	uiFree(c);
-}
-
-void childDestroy(struct child *c)
-{
-	uiControl *child;
-
-	child = c->c;
-	childRemove(c);
-	uiControlDestroy(child);
-}
-
-HWND childHWND(struct child *c)
-{
-	return c->hwnd;
-}
-
-void childMinimumSize(struct child *c, uiWindowsSizing *d, intmax_t *width, intmax_t *height)
-{
-	uiWindowsControl *wc;
-	intmax_t left, top, right, bottom;
-
-	wc = uiWindowsControl(c->c);
-	(*(wc->MinimumSize))(wc, d, width, height);
-	if (c->tabpage != NULL && c->margined) {
-		tabPageMargins(c->tabpage, &left, &top, &right, &bottom);
-		*width += left + right;
-		*height += top + bottom;
-	}
-}
-
-void childRelayout(struct child *c, intmax_t x, intmax_t y, intmax_t width, intmax_t height)
-{
-	uiWindowsControl *wc;
-	intmax_t left, top, right, bottom;
-
-	if (c->tabpage != NULL) {
-		uiWindowsEnsureMoveWindowDuringResize(c->tabpage, x, y, width, height);
-		x = 0;		// and make relative to the client rect of the tab page
-		y = 0;
-		if (c->margined) {
-			tabPageMargins(c->tabpage, &left, &top, &right, &bottom);
-			x += left;
-			y += top;
-			width -= left + right;
-			height -= top + bottom;
-		}
-	}
-	wc = uiWindowsControl(c->c);
-	(*(wc->Relayout))(wc, x, y, width, height);
-}
-
-void childQueueRelayout(struct child *c)
-{
-	uiWindowsControlMinimumSizeChanged(uiWindowsControl(c->c));
-}
-
-int childVisible(struct child *c)
-{
-	return controlSelfVisible(c->c);
-}
-
-void childUpdateState(struct child *c)
-{
-	controlUpdateState(c->c);
-}
-
-void childAssignControlIDZOrder(struct child *c, LONG_PTR *controlID, HWND *insertAfter)
-{
-	uiWindowsControl *wc;
-
-	wc = uiWindowsControl(c->c);
-	(*(wc->AssignControlIDZOrder))(wc, controlID, insertAfter);
-}
-
-void childSetSoleControlID(struct child *c)
-{
-	uiWindowsEnsureAssignControlIDZOrder(c->hwnd, 100, NULL);
-}
-
-HWND childTabPage(struct child *c)
-{
-	return c->tabpage;
-}
-
-int childMargined(struct child *c)
-{
-	return c->margined;
-}
-
-void childSetMargined(struct child *c, int margined)
-{
-	c->margined = margined;
-	uiWindowsControlMinimumSizeChanged(uiWindowsControl(c->c));
-}
-
-int childFlag(struct child *c)
-{
-	return c->flag;
-}
-
-void childSetFlag(struct child *c, int flag)
-{
-	c->flag = flag;
-}
-
-intmax_t childIntmax(struct child *c, int n)
-{
-	return c->im[n];
-}
-
-void childSetIntmax(struct child *c, int n, intmax_t to)
-{
-	c->im[n] = to;
-}
diff --git a/windows/uipriv_windows.hpp b/windows/uipriv_windows.hpp
index f927d87f..b62e8fc9 100644
--- a/windows/uipriv_windows.hpp
+++ b/windows/uipriv_windows.hpp
@@ -131,25 +131,3 @@ extern void tabPageMinimumSize(struct tabPage *tp, intmax_t *width, intmax_t *he
 
 // TODO
 #include "_uipriv_migrate.hpp"
-
-// TODO
-// child.cpp
-extern struct child *newChild(uiControl *child, uiControl *parent, HWND parentHWND);
-extern struct child *newChildWithTabPage(uiControl *child, uiControl *parent, HWND parentHWND);
-extern void childRemove(struct child *c);
-extern void childDestroy(struct child *c);
-extern HWND childHWND(struct child *c);
-extern void childMinimumSize(struct child *c, uiWindowsSizing *d, intmax_t *width, intmax_t *height);
-extern void childRelayout(struct child *c, intmax_t x, intmax_t y, intmax_t width, intmax_t height);
-extern void childQueueRelayout(struct child *c);
-extern int childVisible(struct child *c);
-extern void childUpdateState(struct child *c);
-extern void childAssignControlIDZOrder(struct child *c, LONG_PTR *controlID, HWND *insertAfter);
-extern void childSetSoleControlID(struct child *c);
-extern HWND childTabPage(struct child *c);
-extern int childMargined(struct child *c);
-extern void childSetMargined(struct child *c, int margined);
-extern int childFlag(struct child *c);
-extern void childSetFlag(struct child *c, int flag);
-extern intmax_t childIntmax(struct child *c, int n);
-extern void childSetIntmax(struct child *c, int n, intmax_t to);