Illegal URLs (RFC2396) in Filemanager

When opening the file manager via an RTE (fck) a request with this URL is done by the browser:
/jahia/ajaxaction/GetChildren?params=/op/edit/pid/1286&display=listView|.bmp,.gif,.jpe,.jpeg,.jpg,.png,.tif,.tiff

The problem is that | is used. This may cause trouble with proxies, since that character may not be
used within an URL (see RFC2396).

Same problem, when a file with space should be deleted in the file manager. Here a request with this URL
is sent:
/jahia/Jahia/engineName/filemanager/op/edit/pid/1?screen=fileDelete&path=/shared/Bannerbilder/Startseite/Ottfried|20Fischer.jpg&source=fileManager

We have a working workaround, just reporting this issue because we stepped over this.