>>I think WinXP can open ZIP-ed files. Also why you dind't make backup as a Selfextract file? The you didn't need bat, PKUNZIP etc. files.
>
>Yes, you are right, WinXP will open my ZIP files. But often times the computer is Win2K where this feature is not available. I could do the Selfextracting file, I have not thought about it. Thank you very much.
>
>But I am still wondering if there are other ways to open my .ZIP file, besides the Selfextracting approach.

Don't know, maybe something like temporary maping the drive and then release it in BAT file:
NET USE Z: \\UNCpathHere
pkunzip z:\zip file
NET USE Z: /DELETE