PI can pull a file as big as 2 GB as well. However its not recommeded. You might have to set time out parameters fo PI to get this file in and can also consider options to pick up files in chunk as suggested by Inaki above.
if you read the question 14 (Q: Which memory requirements does the File Adapter have? Is there a restriction on the maximum file size it can process?) in this note 821267 - FAQ: XI 3.0 / PI 7.0 / PI 7.1 / PI 7.3 File Adapter, shows that the size restriction depends about several factors, i recommend that you read it.
Check also this thread
Also, i suggest that you read this blog if you would need to work with big files:
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