Base64Binary OSB and File Adapter Issue

Hi all,
I am converting an xml to flat file after that i want to write the flatfile to a file using File Adapter in OSB.
So using java callout we converted the binary content to base64 string and we are able to write the data using file adapter .
But the file contains as extra line in between each line which my legacy system wont accept.
I printed the base64 string in the output file and when i decode that file using the website as safe decode as text i am able to get the correct file.
So where is the problem ? File Adapter ? Why i am getting extrace line in between each line . How to write safely using file adapter.
If i use file transport of OSB i am able to write without any issues but i want to write dynamic location so i am looking for file transport of OSB.
Thanks
Phani

Hi Anju,
Thanks for the response . If i decode the base64 binary data using this website if i use Notepad++ i cant see an extra line in the notepad++ it showing as below
Its a fixed length file 1 to 513 then next line so for the file transport it showing as below
ISA ............................
1 to 513 CRLF
For file adapter it is showing as below in the same notepad++ editor
ISA..........................
1 to 513 CR
CRLF
an extra CR so an extra line .
I used MFL and converted the xml to non-xml ( flat file fixed length file) for file transport i am i created another proxy message type Text .It is working fine
Added to the above problem i have another few questions on the file transport
How can append to an exiting file using File transport ?
How to change the File directory dynamically ?

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http://www.seeburger.com/xi-adapters/
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