Don't expand MyComputer in the file dialogs without user interaction,

dlls/commdlg/Makefile.in

@@ -4,7 +4,7 @@ SRCDIR    = @srcdir@
 VPATH     = @srcdir@
 MODULE    = comdlg32.dll
 IMPORTLIB = libcomdlg32.$(IMPLIBEXT)
-IMPORTS   = shell32 shlwapi comctl32 winspool user32 gdi32 kernel32 ntdll
+IMPORTS   = shell32 shlwapi comctl32 winspool user32 gdi32 advapi32 kernel32 ntdll
 EXTRALIBS = -luuid
 
 C_SRCS = \

dlls/commdlg/filedlg.c

@@ -67,6 +67,7 @@
 #include "wine/unicode.h"
 #include "wingdi.h"
 #include "winuser.h"
+#include "winreg.h"
 #include "commdlg.h"
 #include "dlgs.h"
 #include "cdlg.h"
@@ -2486,6 +2487,27 @@ static void FILEDLG95_FILETYPE_Clean(HWND hwnd)
  *
  * Initialisation of the look in combo box
  */
+
+/* Small helper function, to determine if the unixfs shell extension is rooted 
+ * at the desktop. Copied from dlls/shell32/shfldr_unixfs.c. 
+ */
+static inline BOOL FILEDLG95_unixfs_is_rooted_at_desktop(void) {
+    HKEY hKey;
+    const static WCHAR wszRootedAtDesktop[] = { 'S','o','f','t','w','a','r','e','\\',
+        'M','i','c','r','o','s','o','f','t','\\','W','i','n','d','o','w','s','\\',
+        'C','u','r','r','e','n','t','V','e','r','s','i','o','n','\\',
+        'E','x','p','l','o','r','e','r','\\','D','e','s','k','t','o','p','\\',
+        'N','a','m','e','S','p','a','c','e','\\','{','9','D','2','0','A','A','E','8',
+        '-','0','6','2','5','-','4','4','B','0','-','9','C','A','7','-',
+        '7','1','8','8','9','C','2','2','5','4','D','9','}',0 };
+    
+    if (RegOpenKeyExW(HKEY_LOCAL_MACHINE, wszRootedAtDesktop, 0, KEY_READ, &hKey) != ERROR_SUCCESS)
+        return FALSE;
+        
+    RegCloseKey(hKey);
+    return TRUE;
+}
+
 static void FILEDLG95_LOOKIN_Init(HWND hwndCombo)
 {
   IShellFolder	*psfRoot, *psfDrives;
@@ -2525,6 +2547,9 @@ static void FILEDLG95_LOOKIN_Init(HWND hwndCombo)
       {
 	FILEDLG95_LOOKIN_AddItem(hwndCombo, pidlTmp,LISTEND);
 
+	/* If the unixfs extension is rooted, we don't expand the drives by default */
+	if (!FILEDLG95_unixfs_is_rooted_at_desktop()) 
+	{
 	  /* special handling for CSIDL_DRIVES */
 	  if (COMDLG32_PIDL_ILIsEqual(pidlTmp, pidlDrives))
 	  {
@@ -2545,6 +2570,8 @@ static void FILEDLG95_LOOKIN_Init(HWND hwndCombo)
 	      IShellFolder_Release(psfDrives);
 	    }
 	  }
+	}
+
         COMDLG32_SHFree(pidlTmp);
       }
       IEnumIDList_Release(lpeRoot);