diff --git a/docs/changes.txt b/docs/changes.txt
index 675b050046..5aff49c6a3 100644
--- a/docs/changes.txt
+++ b/docs/changes.txt
@@ -123,6 +123,7 @@ wxMSW:
   even try to do it by default -- now it does
 - wxTaskBarIcon must be explicitly destroyed now, otherwise the application
   won't exit even though there are no top level windows
+- wxFileName::GetModificationTime() works with opened files too now
 
 wxMotif:
 
diff --git a/src/common/filename.cpp b/src/common/filename.cpp
index 5bebeedae0..a746dd77b6 100644
--- a/src/common/filename.cpp
+++ b/src/common/filename.cpp
@@ -163,7 +163,8 @@ public:
                      filename,                      // name
                      mode == Read ? GENERIC_READ    // access mask
                                   : GENERIC_WRITE,
-                     0,                             // no sharing
+                     FILE_SHARE_READ |              // sharing mode
+                     FILE_SHARE_WRITE,              // (allow everything)
                      NULL,                          // no secutity attr
                      OPEN_EXISTING,                 // creation disposition
                      0,                             // no flags