When you have a multipart file i.e
all parts form a chain.
what it does is that when reading the first part test.part1.rar,it extracts all the file contents spanning all other parts but also scans the filenames for the rest of the parts so that in a batch job they do not get needelsy processed again since they have been already extracted;that is the caching process.
The "error" you see simply means that it has already seen the other parts and so diregards their processing.
That is not the cause of the file not being extracted.
Post your code to check what you are trying to do
Also can you tell me how to process each extracted file one at a time such that one file is extracted and its contents are processed for a regex than the next one is processed in similar fashion and so on instead of just extracting in a single go?
unfortunatelly this cannot happen;everything has to uncompressed in one go