Question on IFS

Hi,
 
I am reading a long string (15,000 bytes) and writing the string into
IFS. I use the APIs open( ) to open an IFS file and write( ) to write
into the IFS file.
 
The problem I am facing is this:
When I write the string into the IFS stream file, the IFS stream file
has a width of 4099. After 4099 bytes, there is an end-of-line character
denoted by a Carriage return and the rest of the data appears in the
next line. 
 
The code that I using is this:
------------------------------------------------------------------------
-------------------------------------------------------------
D O_CREAT         S             10I 0 INZ(8)
D O_RDWR          S             10I 0 INZ(4)
D O_TEXTDATA      S             10I 0 INZ(16777216) 
D O_CODEPAGE      S             10I 0 INZ(8388608)  
D O_CCSID         S             10I 0 INZ(32)       
D Oflag           S             10I 0 INZ(0)  
D Omode           S             10U 0 INZ(511)
D cp              S             10U 0 INZ(819)
D FileNam         S             50A                      
D FileNamP        S               *   INZ(%ADDR(FileNam))
D ZeroBin         S              1A   INZ(*ALLX'00')     
D MSG             S          65000A                  
D MSGP            S               *   INZ(%ADDR(MSG))
 
C                   EVAL      FileNam = Path                    
C                   EVAL      FileNam = %TRIM(FileNam) + ZeroBin
C                   EVAL      Fd=open(FileNamP:Oflag:Omode:cp)
 
C                   Z-add     O_CREAT       Oflag
C                   Add       O_RDWR        Oflag
C                   Add       O_CCSID       Oflag
C                   Add       O_TEXTDATA    Oflag
 
C                   EVAL      Fd=open(FileNamP:Oflag:Omode:cp)
 
C                   EVAL      MSG = %TRIM(MSG) + ZeroBin 
 
C                   EVAL      RT=write(FD:msgP:%len(msg))
 
C                   Eval      RT=close(fd)               
------------------------------------------------------------------------
------------------------------------------------------------------------
--
 
What I want to know is this: 
1. How and where is this constraint of 4099 specified. The documentation
of write( ) API does not specify any such constraint. 
2. Is it possible to write the stream file without the carriage return
at the end-of-line?
 
 
Regards
Kumaravel

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