Stopping the File Open At the End of Loop

Question

How can I make the script skip the "docRef = open(fileList[i])" at the end of the iteration once all the files are opened? Is there a way to get rid of
this by perhaps getting the total number of files on a folder and assigned it as a variable 'max", such that if the variable "i" is eventually equal to
"max," the the script will not execute the last action on the iteration?
As of now, this loop (taken from Paul Riggott's response to my question before regarding folder processing) is generating the following error:
Error 8000: Cannot open the file because the open options are incorrect
Line: 20
-> docRef=open(fileList[i]);
Here is the script I am working on:
var startDisplayDialogs = app.displayDialogs
app.displayDialogs = DialogModes.NO
// ask the user for the input and output folders
var inputFolder = Folder.selectDialog("Select a folder to process")
var outputFolder = Folder.selectDialog("Select a folder for the output files")
if (inputFolder != null && outputFolder != null) {
// get all the files found in this folder
var fileList = inputFolder.getFiles()
// open each one in turn
for (var i = 0; i < fileList.length; i++) {
// The fileList includes both folders and files so open only files
if (fileList[i] instanceof File && fileList[i].hidden == false) {
// get a reference to the new document
var docRef = open(fileList[i]);

Answer 1

The main problem is
var fileList = inputFolder.getFiles();
You are getting a list of all files and folders that exist in that folder, they could be text files etc.
It is better to specify the file types IE:
var fileList = inputFolder.getFiles(/\.(jpg|tif||psd|)$/i);
As this will only get a list of files that are jpg, tif or psd