Monitor directory containing zip files

Hi,

I'm trying to monitor a directory which contains zip files. The zip files contain different file types, and I'm only interested in indexing the txt files. My path would be something like: dir\something.zip\file.txt

I have tried some different monitor approaches, but either nothing gets indexed or all of the files in my zip file are indexed. Here are a few examples of what I have tried in inputs.conf:

[monitor://C:\Users\angeliga\Filer\...]
disabled = false
followTail = 0
sourcetype = my_type
whitelist=*.txt

[monitor://C:\Users\angeliga\Filer\...\*.txt]
disabled = false
followTail = 0
sourcetype = my_type

Does anybody have any idea of what I'm doing wrong? Thanks!