I beleve you have test before you have post.
I too !
In attachement : my (very simple) xml and xsl doc.
When I test it with Oxygen, the number "1234.5" is tranformed to "1.234,50".
When I drag and drop the xml document onto the FileMaker Developer 7.0v3 icon, using the xsl doc, the result = "1234.5" and that's not ok.
number.zip