This can't be done.
Some References:
W3C: A vocabulary and associated APIs for HTML and XHTML
4.10.7.1.18 File Upload state (type=file):
For historical reasons, the value IDL attribute prefixes the filename with the string "C:\fakepath\". Some legacy user agents actually included the full path (which was a security vulnerability).
4.10.7.4 Common input element APIs
input . value [ = value ]
filename
On getting, it must return the string "C:\fakepath\" followed by the filename of the first file in the list of selected files, if any, or the empty string if the list is empty. On setting, if the new value is the empty string, it must empty the list of selected files; otherwise, it must throw an InvalidStateError exception.
Note: This "fakepath" requirement is a sad accident of history. See the example in the File Upload state section for more information.
Mozilla Developer Network
Using files from web applications
Getting information about selected files
There are three attributes provided by the File object that contain useful information about the file.
1) name
The file's name as a read-only string. This is just the file name, and does not include any path information.
Internet Explorer Developer Center > Docs > Internet Explorer API reference > HTML/XHTML Reference > Properties >
value (Input type=file)
Remarks:
Windows Internet Explorer 8 and later. When a file is selected by using the input type=file object, the value of the value property depends on the value of the "Include local directory path when uploading files to a server" security setting for the security zone used to display the Web page containing the input object.
The fully qualified filename of the selected file is returned only when this setting is enabled. When the setting is disabled, Internet Explorer 8 replaces the local drive and directory path with the string C:\fakepath\ in order to prevent inappropriate information disclosure.
To illustrate, suppose you attempt to upload a file named C:\users\contoso\documents\file.txt. When you do this, the value of the value property is set to c:\fakepath\file.txt.
Browsers don't pass the path from the client computer's directories to the web page, it's a security and privacy issue. They only pass the actual file that has been selected.
CkEditor doesn't control the file uploads. The file browser/uploader does, but it only passes the destination URL to CkEditor.
The file browser/uploader is controlled via the _source\plugins\filebrowser\plugin.js file which is called by filebrowser in the flash.js file.
You can check the location of your file browser and uploader by looking at these settings in your config:
config.filebrowserFlashBrowseUrl =
config.filebrowserFlashUploadUrl =
Based on your comments, you are using the CkFinder file manager: CkFinder - Ajax File Manager
It's produced by the same people that make CkEditor, but it's not free like CkEditor. The income from CkFinder licenses helps keep CkEditor free and up to date.
