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I need to batch this for hundreds of files... A great someone helped with the solution today, I am attachimg a PS script just In case some needs this in the future. It replaces the word "Hello" with the contens of an external file. For paragraph breaks use \n\n

var file = new File ( "C:\\the-text-file.txt" );    

file.open("r");

var open_the_file = file.read();

 

var str = String(open_the_file).split("\\n").join("\r");

 

var id3 = stringIDToTypeID( "replace" );

var desc2 = new ActionDescriptor();

var id4 = charIDToTypeID( "null" );

    var ref1 = new ActionReference();

    var id5 = charIDToTypeID( "Prpr" );

    var id6 = stringIDToTypeID( "replace" );

    ref1.putProperty( id5, id6 );

    var id7 = charIDToTypeID( "TxLr" );

    var id8 = charIDToTypeID( "Ordn" );

    var id9 = charIDToTypeID( "Al  " );

    ref1.putEnumerated( id7, id8, id9 );

    desc2.putReference( id4, ref1 );

    var id10 = charIDToTypeID( "Usng" );

    var desc3 = new ActionDescriptor();

    var id11 = stringIDToTypeID( "find" );

    desc3.putString( id11, "Hello" );

    var id12 = stringIDToTypeID( "replace" );

    desc3.putString( id12, str );

    var id13 = stringIDToTypeID( "checkAll" );

    desc3.putBoolean( id13, true );

    var id14 = charIDToTypeID( "Fwd " );

    desc3.putBoolean( id14, false );

    var id15 = stringIDToTypeID( "caseSensitive" );

    desc3.putBoolean( id15, true );

    var id16 = stringIDToTypeID( "wholeWord" );

    desc3.putBoolean( id16, false );

    var id17 = stringIDToTypeID( "findReplace" );

    desc2.putObject( id10, id17, desc3 );

    executeAction( id3, desc2, DialogModes.NO );