Files with .a extension using ftp transport

Hi.
Am using ftp adapter in osb to read .txt files(e.g. abcd.txt) from ftp location, process the body/text() in OSB and then place the incoming file to an outbound folder.
the flow is like ftp-> Proxy Service->Business Service->outbound ftp
the service works fine where then is less load or the no. of incoming files is less.
However,sometimes the outbound folder contains the files with .a extension at the end.(e.g. abcd.txt.a)
Can someone tell me the rootcause of these .a file creation and the scenarios in which the .a files are created.
Also,please tell me what are these .a files meant for?
How,can I eliminate this while configuring the services using ftp transport.
Thanks in adavance

I had this recently with a variety of FTP servers, FileZilla, Microsoft etc.
For me, it happened when the file already exists in the destination and I was expecting the destination file to be overwritten. My application would generate the same filename, say FileA.txt and expect that to be overwritten, but with OSB 10gR3 I would get files with .a stuck on the end.
This functionality changed between ALSB and OSB and I had a patch developed to restore the ALSB functionality.
I spent ages looking at it, and debugging FTP commands and going from memory, I'm pretty certain that the FTP adapter doesn't implement the correct FTP spec for the RNFR command according to the RFC in the case where a file already exists - it doesn't handle overwrite.
Hope that may help.
Pete

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