Index: /trunk/src/org/openstreetmap/josm/Main.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/Main.java	(revision 5239)
+++ /trunk/src/org/openstreetmap/josm/Main.java	(revision 5240)
@@ -639,5 +639,5 @@
         if(s.startsWith("http:")) return DownloadParamType.httpUrl;
         if(s.startsWith("file:")) return DownloadParamType.fileUrl;
-        String coorPattern = "\\s*[0-9]+(\\.[0-9]+)?\\s*";
+        String coorPattern = "\\s*[+-]?[0-9]+(\\.[0-9]+)?\\s*";
         if(s.matches(coorPattern+"(,"+coorPattern+"){3}")) return DownloadParamType.bounds;
         // everything else must be a file name