yesterday and today avast say mswork file : WKSAB.EXE infect …is not true !!!
https://www.virustotal.com/it/file/581ba965c11264935e7be242db9f0bef220e5222c9d08643aeec7e875561e76b/analysis/
You can report a possible FP here: http://www.avast.com/contact-form.php
It was already fixed. Update your VPS, please.
Milos