Vista - Reading data from a cat-file via vbscript?

Hello, Scripting -gurus!
I really need some help from the experts here.

I have a vbscript that copies some files from a to b,
but I want to make sure, that I will only copy the "original" files
and not any modified ones.

In the source-location I already have a *.cat-file that includes all
SHA1-hashes and names of the files I want to copy.

So how can I "open" this cat-file and get the individual hashes and
filenames out of this file?

Up to now I were able to use the CAPICOM-lib to generate an SHA1-hash
for every file, but I am still not able to compare this with the SHA1-
hash in the CAT-file.

Can some one please help here?

Greetings,
Carsten