Index: /trunk/src/org/openstreetmap/josm/Main.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/Main.java	(revision 4900)
+++ /trunk/src/org/openstreetmap/josm/Main.java	(revision 4901)
@@ -639,7 +639,6 @@
         if(s.startsWith("http:")) return DownloadParamType.httpUrl;
         if(s.startsWith("file:")) return DownloadParamType.fileUrl;
-        final StringTokenizer st = new StringTokenizer(s, ",");
-        // we assume a string with exactly 3 commas is a bounds parameter
-        if (st.countTokens() == 4) return DownloadParamType.bounds;
+        String coorPattern = "\\s*[0-9]+(\\.[0-9]+)?\\s*";
+        if(s.matches(coorPattern+"(,"+coorPattern+"){3}")) return DownloadParamType.bounds;
         // everything else must be a file name
         return DownloadParamType.fileName;