archives on-access is to add the line
<STANDARD--ScanPackers>EXE;ZIP;MIME;RAR;ARJ;TAR;GZ</STANDARD--ScanPackers>
I looked at the lines further down in the file and the looked similar, but had some extra file-extensions, and "overwrite=no" in the tag, should those additions be added to the tag you suggested too (are they newer additions since your original posting) or....
<OUTLOOK--ScanPackers overwrite="no">EXE;ZIP;MIME;RAR;ARJ;TAR;GZ;CAB;ARC;ACE;ZOO;BZIP2;WinExec</OUTLOOK--ScanPackers>
<MAIL--ScanPackers overwrite="no">EXE;ZIP;MIME;RAR;ARJ;TAR;GZ;CAB;ARC;ACE;ZOO;BZIP2;WinExec</MAIL--ScanPackers>
<P2P--ScanPackers overwrite="no">EXE;ZIP;MIME;RAR;ARJ;TAR;GZ;CAB;ARC;ACE;ZOO;BZIP2;WinExec</P2P--ScanPackers>
<IM--ScanPackers overwrite="no">EXE;ZIP;MIME;RAR;ARJ;TAR;GZ;CAB;ARC;ACE;ZOO;BZIP2;WinExec</IM--ScanPackers>