>>>>>At the end of Text Line, in the original one there is LF and in the replaced one there is CRLF. I exactly used what was suggested.
>>>>>If I copy and Paste from Elsewhere, I get LF at the end, but using the replace command I get CRLF
>>>>
>>>>
>>>>No way. Check attachments.
>>>
>>>Sir, Please Check The My original File attached. It can be opened in Notepad. (Not Regular Notepad that comes with windows)
>>>At Line No 23 the Text is to be replaced. This is not working here.
>>
>>What is your FULL code?
>
>Here is the code
>
>

>CPSFILEPATH=Alltrim(cFullpath) && Original file will be picked from Here
>NEWPATH=Alltrim(NEWPATH)  && New rewritten file will be Placed Here
>
>Create Cursor BILLCOMPRESS (POS C(254))  && Create Temporary Cursor Billcompress to Check Page Numbers
>Select BILLCOMPRESS
>Append From (m.CPSFILEPATH) Sdf && Appends in Standard Data Format
>*Count Number of Pages in PS File
>Locate For Alltrim(POS)='%%Page: 1 1'
>IF Found()
>Skip
>IF ALLTRIM(LEFT(POS,9))="<</Duplex"
>Replace POS With '<</Duplex false/PageSize  [595 842] /Tumble false /ManualFeed false /MediaPosition 0>>  setpagedevice'+ CHR(10)
>ENDIF
>ENDIF
>
>Set Textmerge On
>Set Textmerge To (m.NEWPATH) Noshow
>Scan
>\\<< TRIM(POS) >>
>\
>Endscan
>Set Textmerge To
>Set Textmerge Off
>

Scan
\\<< TRIM(POS) >>
\ && THIS line adds CRLF into the file
Endscan

Try this:

CPSFILEPATH=Alltrim(cFullpath) && Original file will be picked from Here
NEWPATH=Alltrim(NEWPATH)  && New rewritten file will be Placed Here

Create Cursor BILLCOMPRESS (POS C(254))  && Create Temporary Cursor Billcompress to Check Page Numbers
Select BILLCOMPRESS
Append From (m.CPSFILEPATH) Sdf && Appends in Standard Data Format
*Count Number of Pages in PS File
Locate For Alltrim(POS)='%%Page: 1 1'
IF Found()
   Skip
   IF ALLTRIM(LEFT(POS,9))="<</Duplex"
      Replace POS With '<</Duplex false/PageSize  [595 842] /Tumble false /ManualFeed false /MediaPosition 0>>  setpagedevice'
   ENDIF
ENDIF

STRTOFILE([], NEWPATH, .f.)
Scan
   STRTOFILE(TRIM(POS)+CHR(10), NEWPATH, .t.)
Endscan

NOT TESTED