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^j::
; write to the Array:
ArrayCount = 0
Loop, Read, C:\List.txt
{
    ArrayCount += 1
    Array%ArrayCount% := A_LoopReadLine
}

; read from the Array:
Loop %ArrayCount%
{
    element := Array%A_Index%
    MsgBox % "Element number " . A_Index . " is " . Array%A_Index%
}
Return

Loop,c:\temp\screenshot\*
 FileAppend,%A_LoopFileFullPath%`n,C:\List.txt

^j::

; read screenshot directory
Loop,c:\test\*
    FileAppend,%A_LoopFileFullPath%`n, C:\screenshots.txt

; write to the Array:
ArrayCount = 0
Loop, Read, C:\screenshots.txt
{
    ArrayCount += 1
    Array%ArrayCount% := A_LoopReadLine
}

; read from the Array:
Loop %ArrayCount%
{
    element := Array%A_Index%
    MsgBox % element
}
FileDelete, C:\screenshots.txt
Return