make detecting if it's a soundfile more flexible on windows.

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@2577 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/mod/applications/mod_conference/mod_conference.c

@@ -1019,7 +1019,7 @@ static switch_status_t conference_play_file(conference_obj_t *conference, char *
     }
 
 #ifdef WIN32
-	if (file[1] != ':') {
+	if (*(file +1) != ':' && *file != '/') {
 #else
 	if (*file != '/') {
 #endif