The following documentation describes an integration scenario in which the business system, which is connected to the Integration Server by means of the file adapter, takes on the role of either a sender system or a receiver system, or both.
Use
Many external or legacy systems cannot exchange data by means of messages and http. However, these systems often have a file interface. This file interface enables you to use the file adapter to connect such systems to the Integration Server. For more information about configuring the file adapter, see: 
File/FTP Adapter
Description
An external or legacy system is connected to the Integration Engine by means of the file adapter. The file adapter receives a file from an external system and converts it into a message, which can then be processed further by the Integration Engine.
To forward a message to an external receiver system, the file adapter receives the message from the Integration Engine, converts it into a text file and then writes this file to the file system of the external receiver system.
Example
The file adapter receives a file from an external system. This file is converted into a message and is processed further by the Integration Engine. Two receivers of the message are determined
· Another external system
· An SAP system, which is able to receive messages directly
The receiver file adapter converts the message back into a file and writes this file to the file system of the other external system. The SAP system on the other hand simply receives a message.
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