From http://www.w3schools.com (Copyright Refsnes Data)

ASP ShortPath Property

The ShortPath property is used to return the short path of the specified file or folder (the 8.3 naming convention).

Syntax

FileObject.ShortPath

FolderObject.ShortPath

Example for the File object

<%
dim fs,f
set fs=Server.CreateObject("Scripting.FileSystemObject")
set f=fs.GetFile("c:\asp_test_web\hitcounterfile.txt")
Response.Write("Path: " & f.Path)
Response.Write("<br />ShortPath: " & f.ShortPath)
set f=nothing
set fs=nothing
%>

Output:

Path: C:\asp_test_web\hitcounterfile.txt
ShortPath: C:\ASP_TE~1\HITCOU~1.TXT

Example for the Folder object

<%
dim fs,fo
set fs=Server.CreateObject("Scripting.FileSystemObject")
set fo=fs.GetFolder("c:\asp_test_web")
Response.Write("Path: " & fo.Path)
Response.Write("<br />ShortPath: " & fo.ShortPath)
set fo=nothing
set fs=nothing
%>

Output:

Path: C:\asp_test_web
ShortPath: C:\ASP_TE~1

Complete Folder Object Reference