Magento Add Product fails with failed to open stream: No such file or directory

Problem Description
In the Magento Admin Panel under Catalog menu you click Manage Products. And now you try to Add a new product after clicking Add Product button. After giving product information whenever you try to save the product it fails with following errors.

Warning: include(Mage\Catalog\Model\Resource\Eav\Mysql4\Product\Attribute\Backend\Tierprice.php) [function.include]: failed to open stream: No such file or directory in E:\xampp\htdocs\magento\lib\Varien\Autoload.php on line 93

Cause of the Problem
As the error says the system could not find file Tierprice.php in the location Mage\Catalog\Model\Resource\Eav\Mysql4\Product\Attribute\Backend and hence it throws error.

Solution of the Problem
Go to the directory and you will see the file named as Tierprice.php0000664. You need to rename that file to Tierprice.php and then try to add product in magento.
Here from windows XP machine I used xampp and from command line I renamed the file. Following is the copy paste information from the command line windows command prompt.

E:\Documents and Settings\Arju>cd E:\xampp\htdocs\magento\app\code\core\Mage\Catalog\Model\Resource\Eav\Mysql4\Product\Attribute\Backend

E:\xampp\htdocs\magento\app\code\core\Mage\Catalog\Model\Resource\Eav\Mysql4\Product\Attribute\Backend>dir
 Volume in drive E is New Volume
 Volume Serial Number is 889B-18A3

 Directory of E:\xampp\htdocs\magento\app\code\core\Mage\Catalog\Model\Resource\Eav\Mysql4\Product\Attribute\Backend

12/06/2009  04:09 PM    <DIR>          .
12/06/2009  04:09 PM    <DIR>          ..
09/24/2009  12:52 AM             1,635 Gallery.php
09/24/2009  12:52 AM             2,405 Image.php
09/24/2009  12:52 AM             7,430 Media.php
09/24/2009  12:52 AM             3,168 Tierprice.php0000664
09/24/2009  12:52 AM             1,862 Urlkey.php
               5 File(s)         16,500 bytes
               2 Dir(s)   3,835,740,160 bytes free

E:\xampp\htdocs\magento\app\code\core\Mage\Catalog\Model\Resource\Eav\Mysql4\Product\Attribute\Backend>ren Tierprice.php0000664 Tierprice.php

E:\xampp\htdocs\magento\app\code\core\Mage\Catalog\Model\Resource\Eav\Mysql4\Product\Attribute\Backend>dir
 Volume in drive E is New Volume
 Volume Serial Number is 889B-18A3

 Directory of E:\xampp\htdocs\magento\app\code\core\Mage\Catalog\Model\Resource\Eav\Mysql4\Product\Attribute\Backend

01/18/2010  03:00 PM    <DIR>          .
01/18/2010  03:00 PM    <DIR>          ..
09/24/2009  12:52 AM             1,635 Gallery.php
09/24/2009  12:52 AM             2,405 Image.php
09/24/2009  12:52 AM             7,430 Media.php
09/24/2009  12:52 AM             3,168 Tierprice.php
09/24/2009  12:52 AM             1,862 Urlkey.php
               5 File(s)         16,500 bytes
               2 Dir(s)   3,833,298,944 bytes free