schrieb Joseph Wright: > We really need to see all of you log file. The latest release versions > of the LaTeX3 material all work fine, and define \ExplFileName, etx. I > suspect that something is being loaded 'out of place', but without the > full log can't tell. Sorry for not sending the full log file in the first place. I have suspected it's a problem with the recent reorganization in l3 packages. But since you can't reproduce it ... perhaps it's a Windows specific TL packaging error (Windows 7 Prof. x64)? Anyway, here's the log. Unfortunately, batchmode doesn't give me a full package list. Best regards, Stephan Hennig