Index: reactos/dll/win32/shell32/dialogs/dialogs.cpp
===================================================================
--- reactos/dll/win32/shell32/dialogs/dialogs.cpp	(revision 74622)
+++ reactos/dll/win32/shell32/dialogs/dialogs.cpp	(working copy)
@@ -353,6 +353,44 @@
     EnableWindow(GetDlgItem(hwnd, IDOK), Enable);
 }
 
+static void
+LTrim(LPWSTR psz)
+{
+    WORD wInfo;
+    LPWSTR pch = psz;
+
+    while (GetStringTypeW(CT_CTYPE1, pch, 1, &wInfo))
+    {
+        if (!(wInfo & C1_SPACE))
+        {
+            break;
+        }
+
+        ++pch;
+    }
+
+    MoveMemory(psz, pch, (lstrlen(pch) + 1) * sizeof(WCHAR));
+}
+
+static void
+RTrim(LPWSTR psz)
+{
+    WORD wInfo;
+    LPWSTR pch = psz + lstrlenW(psz);
+
+    while (psz < pch)
+    {
+        if (!GetStringTypeW(CT_CTYPE1, pch - 1, 1, &wInfo) ||
+            !(wInfo & C1_SPACE))
+        {
+            break;
+        }
+
+        --pch;
+        *pch = UNICODE_NULL;
+    }
+}
+
 /* Dialog procedure for RunFileDlg */
 static INT_PTR CALLBACK RunDlgProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
 {
@@ -435,6 +473,9 @@
 
                     GetWindowTextW(htxt, psz, ic + 1);
 
+                    LTrim(psz);
+                    RTrim(psz);
+
                     sei.hwnd = hwnd;
                     sei.nShow = SW_SHOWNORMAL;
                     sei.lpFile = psz;
@@ -482,8 +523,11 @@
                         case RF_OK:
                             if (ShellExecuteExW(&sei))
                             {
-                                /* Call again GetWindowText in case the contents of the edit box has changed? */
                                 GetWindowTextW(htxt, psz, ic + 1);
+
+                                LTrim(psz);
+                                RTrim(psz);
+
                                 FillList(htxt, psz, ic + 2 + 1, FALSE);
                                 EndDialog(hwnd, IDOK);
                                 break;