BizTalk file read...

Pabba

I have a requirement where inbound application creates a data file
(.dat) and a acknowledge file (.ack) in the inbound folder polled by
BizTalk and the imortance of .ack file is to let middleware know that
the .dat file is written and the file is ready to pickup. In a way
this makes sure that Biztalk does not pick incomplete files.

My question is, does BizTalk need to know that inbound file is still
being written and BizTalk should wait untill the whole file is
written?

Thanks,
Kiran Pabba