A .xml file not recognized as a vb file in diagnostics

[Floris]

cpnav_impex.xml File not recognized as part of vBulletin

admincp > diagnostics > file suspect
./includes/xml
cpnav_impex.xml
File not recognized as part of vBulletin

- fresh 3.7.3 pl1 install, hook system turned on, no custom plugins.
- impex latest build installed (downloaded on Saturday; September 13, 2008 @ 12:15 PM)

[Jerry]

Not sure if this would be an impex bug or vBulletin.