Solution:
Windows operating systems, by default, do not show hidden files or protected operating system files. You may need to change these settings, for example, to find a hidden file that you must modify or delete.

Windows 95/98/NT has the option to show or not show hidden files.
Windows Me/2000/XP can also hide protected operating system files.

Follow the instructions for your operating system.

To configure Windows NT 4.0 to show hidden files:
Double-click the My Computer icon on the Windows desktop.
Click the View menu, and then click Options.
Click the View tab and then select "Show all files."

Click Apply, and then click OK.

To configure Windows 95/98 to show hidden files:
Double-click the My Computer icon on the Windows desktop.
Click the View menu, and then click Options or Folder Options.
Click the View tab.

Do one of the following:
Windows 95. Select "Show all files."
Windows 98. In the Advanced settings box, under the "Hidden files" folder, select Show all files.
Click Apply, and then click OK.

To configure Windows Me/2000 to show file extensions:
Double-click My Computer.
Click the Tools menu, and then click Folder Options.
Click the View tab.

Clear "Hide file extensions for known file types."
Under the "Hidden files" folder, select "Show hidden files and folders."
Clear "Hide protected operating system files."
Click Apply, and then click OK.

To configure Windows XP to show file extensions:
Double-click My Computer.
Click the Tools menu, and then click Folder Options.
Click the View tab.

Clear "Hide file extensions for known file types."
Under the "Hidden files" folder, select "Show hidden files and folders."
Clear "Hide protected operating system files."
Click Apply, and then click OK.

Thanks to Symantec for the concise explanation