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Please Help! Something that was supposed to be quite simple just turned out to be "impossible". I just can't get my head around this.

My problem: I've got a string in a text file that I want to find and replace but it seems impossible. I can't find a string in a text file without opening the file as read only and if I open the file in write mode then I can't do a FileRead and only have 2 write options:

1. Append to the end of the file

2. Overwite the entire contents of the file.

I'm obviously missing something?

This is what I've got so far:

if FileExists ($FileName) Then

$file = FileOpen($FileName, 0)

if Not($file = -1) Then

While 1

$line = FileReadLine($file)

;Msgbox (0, 'line', $line)

If @error = -1 Then ExitLoop

$s = StringInStr($line, $Customstr)

if not($s=0) Then

MSGBOX (0, "Match Found", $line)

;Now replace the string...?????






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