diff --git a/dlls/mshtml/nsio.c b/dlls/mshtml/nsio.c
index 7c402b2..9d3b1c6 100644
--- a/dlls/mshtml/nsio.c
+++ b/dlls/mshtml/nsio.c
@@ -2165,10 +2165,26 @@ static nsresult NSAPI nsIOService_NewChannelFromURI(nsIIOService *iface, nsIURI
     nsIChannel *channel = NULL;
     nsChannel *ret;
     nsIWineURI *wine_uri;
+    nsACString schema_str;
+    const char *schema;
+    BOOL b;
     nsresult nsres;
 
     TRACE("(%p %p)\n", aURI, _retval);
 
+    /*
+     * Our wrapped nsChannel object doesn't work for Flash, so we use URI heuristic
+     * and return necko object for *.swf channels.
+     */
+    nsACString_Init(&schema_str, NULL);
+    nsIURI_GetScheme(aURI, &schema_str);
+    nsACString_GetData(&schema_str, &schema);
+    b = !strstr(schema, ".swf");
+    nsACString_Finish(&schema_str);
+
+    if(b)
+        return nsIIOService_NewChannelFromURI(nsio, aURI, _retval);
+
     nsres = nsIIOService_NewChannelFromURI(nsio, aURI, &channel);
     if(NS_FAILED(nsres) && nsres != NS_ERROR_UNKNOWN_PROTOCOL) {
         WARN("NewChannelFromURI failed: %08x\n", nsres);