diff --git "a/dll/win32/comdlg32/filedlg.c" "b/dll/win32/comdlg32/filedlg.c"
index 0adb3357b3a..b55e65e27bc 100644
--- "a/dll/win32/comdlg32/filedlg.c"
+++ "b/dll/win32/comdlg32/filedlg.c"
@@ -754,6 +754,11 @@ void COMDLG32_GetCanonicalPath(PCIDLIST_ABSOLUTE pidlAbsCurrent,
 {
   WCHAR lpstrTemp[MAX_PATH];
 
+#ifdef __REACTOS__  // CORE-15288
+  if (lstrlenW(lpstrFile) > MAX_PATH)
+    lpstrFile[MAX_PATH - 2] = UNICODE_NULL;
+#endif
+
   /* Get the current directory name */
   if (!COMDLG32_GetDisplayNameOf(pidlAbsCurrent, lpstrPathAndFile))
   {
@@ -3124,6 +3129,14 @@ BOOL FILEDLG95_OnOpen(HWND hwnd)
 
   TRACE("count=%u len=%u file=%s\n", nFileCount, sizeUsed, debugstr_w(lpstrFileList));
 
+#ifdef __REACTOS__  // CORE-15288
+  if (sizeUsed >= MAX_PATH)
+  {
+    /* Clear the bad text in the filename dialog box */
+    SendMessageA(fodInfos->DlgInfos.hwndFileName, WM_SETTEXT, 0, (LPARAM)"");
+  }
+#endif
+
 /*
   Step 1:  Build a complete path name from the current folder and
   the filename or path in the edit box.