rolled back this after seeing a comment from Alan:

http://www.nabble.com/Status-Code-400-viewing-or-downloading-artifact-whose-filename-contains-two-consecutive-periods-tt21407604.html

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@14410 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/model/DirectoryBrowserSupport.java

@@ -79,7 +79,7 @@ public final class DirectoryBrowserSupport {
             return;
         }
 
-        String path = getPath(req).replace('\\','/');
+        String path = getPath(req);
         if(path.indexOf("/../")!=-1) {
             // don't serve anything other than files in the artifacts dir
             rsp.sendError(HttpServletResponse.SC_BAD_REQUEST);