Invalid Compressed Data to Inflate

I am a fairly new VB Programmer, so I apologize upfront for any confusion in the way I might describe my problem. My VB 6.0 program uses CDO.Configuration and CDO.Message to send an e-mails automatically with zipped attachments. I have done this to bypass the security prompts in VB programs using Outlook that started happening when we got Microsoft XP. The files that get e-mailed are saved on my C drive and I am able to open them with no problem. But when the file is sent through Outlook 2002 I cannot open the attachments. (This used to work fine). This is the message I receive when I try to open CUSTLIST.PDF

Extracting to “C:\Documents and Settings\NAME\Local Settings\Temp\”
Use Path: no Overlay Files: yes
Warning [C:\Documents and Settings\NAME\Local Settings\Temporary Internet
Files\OLK6\Reports122004.
Error in file #1: bad Zip file offset (Error local header signature not
found): 0
(attempting to re-compensate)
Extracting CUSTLIST.PDF
Error: invalid compressed data to inflate

I beleive it is related to the new security in Outlook 2002, but have no idea how to make it work. Any ideas? Thank-you for any help on this!