--- a/libpurple/protocols/msn/slplink.c Mon Mar 15 21:49:02 2010 +0000 +++ b/libpurple/protocols/msn/slplink.c Tue Mar 16 23:14:54 2010 +0000 @@ -673,7 +673,7 @@ size = purple_xfer_get_size(xfer); - purple_xfer_prepare_thumbnail(xfer); + purple_xfer_prepare_thumbnail(xfer, "png"); if (!file_name) { gchar *basename = g_path_get_basename(file_path);