Assuming your company data extension is BIO, the file created by Payables for retrieval into Time&Billing is APTBBTCH.BIO. I also assume the file name you typed into your posting has a couple of spelling mistakes.

At what point do you receive the error? As soon as you start the 'Retrieve batches from AP' function, or when you attempt to retrieve it, or at a different time? This might be helpful.

Perhaps another 'test' for the file is if you can find it in the L:/data directory and if so, can you rename the file? I agree with Andrew that rebooting may be necessary.

I assume that workstation and network rights have not changed, preventing the user the ability to see, read and write/purge the APTBBTCH file.