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How can I search for a string in a file and replace that found string with the contents of another file?

The only way I've found so far involves strings, but the strings aren't large enough to hold the file... any help or suggestions?

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Registered: Jul 2004
From:

code:
Name "Output"
OutFile "Output.exe"

!include "TextFunc.nsh"
!insertmacro LineFind

!include "WordFunc.nsh"
!insertmacro WordFind

Var PMEMORY
Var SIZE

Section
	StrCpy $0 "C:\Input.txt"      #File to replace in
	StrCpy $1 "C:\Output.txt"     #File result
	StrCpy $R0 "ReplaceIt"        #Replace string
	StrCpy $R1 "C:\Source.txt"    #File replace with content
	StrCpy $R2 "0"                #Changes to made ("0" - replace all)
	StrCpy $R3 "0"                #Count of changes (start with "0")

	${LineFind} "$0" "$1" "1:-2 -1" "LineFindCallback"

	IfErrors 0 +2
	MessageBox MB_OK "Error"
	MessageBox MB_OK "Changes: $R3"
SectionEnd

Function LineFindCallback
	StrCmp $PMEMORY '0' end

	begin:
	${WordFind} "$R9" "$R0" "E+1{" $1
	IfErrors freemem
	FileWrite $R4 "$1"

	StrCmp $PMEMORY '' 0 write
	FileOpen $1 $R1 a
	FileSeek $1 0 END $SIZE
	System::Alloc $SIZE
	Pop $PMEMORY
	FileSeek $1 0 SET
	System::Call 'kernel32::ReadFile(i r1, i $PMEMORY, i $SIZE, t.,)'
	FileClose $1

	write:
	IntOp $R3 $R3 + 1
	System::Call 'kernel32::WriteFile(i R4, i $PMEMORY, i $SIZE, t.,)'
	${WordFind} "$R9" "$R0" "+1}" $R9
	StrCmp $R3 $R2 0 begin

	freemem:
	StrCmp $PMEMORY '' end
	StrCmp $R7 -1 +2
	StrCmp $R3 $R2 0 end
	System::Free $PMEMORY
	StrCpy $PMEMORY 0

	end:
	Push $0
FunctionEnd

__________________
my functions

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