How to use a botton event import some string from txt to text field

dears,

I have add a botton in acrobat，it‘s javascript code as follow.

this.importDataObject("myData.txt");

var oFile = this.getDataObjectContents("myData.txt");

var cFile = util.stringFromStream(oFile,"GBK");

aFile = cFile.split(";");

this.getField("text0").value = aFile[0];

if (aFile[1] == "1"){

this.getField("text4").value = "Yes";

this.getField("text1").value = aFile[2];

this.getField("text3").value = aFile[3];

this.getField("text4").value = aFile[4];

}

if (aFile[1] == "0"){

this.getField("text5").value = "Yes";

this.getField("text2").value = aFile[2];

this.getField("text5").value = aFile[3];

this.getField("text6").value = aFile[4];

}

Open this with acrobat editer,it works. This fuction will open a dailog,then we can select the txt file,and then the text field will fill up.

but when i open this with acrobat reader,it cann't works. I don't kown how adjust my code,then it can be work in acrobat reader.

please help me,I would appreciate it very much.thanks.