Amavis 2.7.0 keeps .docx Document back in Quaratine

[Marko Weber | ZBF via amavis-users]

Hello,
on SLES Server 11 we use amavis 2.7.0
This Amavis quarantines unregular .docx files.

We tested the same Documents that 2.7.0 quarantines, on a gentoo box 
with amavis 2.7.2.
On amavis 2.7.2 the documents passes clean.

Is there a known bug in 2.7.0 with this?

marko