To submit suspect files for analyses using only Windows XP
1. In Windows Explorer, open the folder that contains the suspect malicious software files.
2. Right-click a blank area in the window, point to New, and then click Compressed (zipped) Folder.
3. Type malware.zip to name the new archive file, and then press ENTER.
4. Drop the suspected malicious software files into the archive file as you would drop them into a typical Windows folder.
5. Double-click the archive file.
6. On the File menu, click Add a Password.
7. In the Password box, type infected
8. In the Confirm Password box, retype infected and then click OK.
Refer to this link for the mailing instructions for your ready to go zipped file.
https://forums.comodo.com/false_positivenegative_reporting_is_this_a_malware_that_cis_hasnot_detected/reporting_false_positivessuspicious_files_submitting_them_to_the_lab-t27062.0.html;msg197464#msg197464Some may find this simpler than installing/using archiving software.
Hope it may help someone.
Later