Powershell – Send Files to a Compressed Folder


This was just fun.

I was bent on the fact that “Windows can Make Zip files, so Powershell SHOULD be able to leverage this!”

I huffed and puffed.  I searched for ComObjects. I found the .DLL.  Nothing worked until I stumbled on a small VB.Net Function Posted in the forums.

Conversion to Powershell was surprisingly easy.  I’ve posted this Script, all it does it create the function SEND-ZIP.   You can add it to your profile.   Running HELP SEND-ZIP will give you the details on how to use it.

The only trick I found is you have to specify the EXACT location of the Zip file to send anything to it.  Something to with .NAMESPACE but it you like, take it and play with it.

Most of all

Enjoy the Power of Shell

the Energized Tech


# Powershell function (Works in 1.0 and 2.0)
# to create a .ZIP file using the native "Send to Compressed Folder"
# feature in Windows explorer.   It then copies files into the "Folder" thus allowing you
# to create a Zip archive natively in Powershell
# Original code from a post by Steve Fulton on
# http://social.msdn.microsoft.com/Forums/en-US/windowsgeneraldevelopmentissues/thread/d3e347cc-f4dc-44a6-8f84-977f958d89c6/
# Using VB.Net
# Orignal Notes and Code from Steve Fulton Follows….
#  1. Copy it EXACTLY as shown, make sure it works, then modify it. For example,
#  "ToString" shouldn’t be required, but is..
#  2. This has only been tested on Windows Vista and Windows Server 2003
#  It should work on any version of Windows that pretends zip files are compressed folders
#  3. This works by creating an empty zip file. Then it copies the file you want to compress into the zip file. Windows will #see that you are copying into a zip file not a folder, and compress it on the way in.
#  ————————————————————-
#  Private Sub zipFile(ByVal filename As String, ByVal zipfilename As String)
#        Dim strZIPHeader As String
#        strZIPHeader = [char]80 + [char]75 + [char]5 + [char]6 + [char]0 + [char]0 + [char]0 + [char]0 + [char]0 + [char]0 + [char]0 + [char]0 + [char]0 + [char]0 + [char]0 + [char]0 + [char]0 + [char]0 + [char]0 + [char]0 + [char]0 + [char]0)
#        Dim fso = CreateObject("Scripting.FileSystemObject")
#        Dim tf = fso.CreateTextFile(zipfilename)
#        tf.Write(strZIPHeader)
#        tf.Close()
#        With CreateObject("Shell.Application")
#            .NameSpace(zipfilename.ToString).CopyHere(filename.ToString)
#        End With
#        MessageBox.Show("All done!")
#    End Sub
# ————————————————————-
# Sean (Energized Tech) Notes.
# I found this immensely cool to play with since (If you look at the Structure) not a
# lot changes between VB.Net and Powershell suggesting it would not be hard to
# translate many functions or applications from VB.Net to Powerhshell

function global:SEND-ZIP ($zipfilename, $filename) {


Function to send Files / Folders to a ZIP file using the native
feature in Windows Vista / 7 / Windows XP

Function to send Files / Folders to a ZIP file using the native
feature in Windows Vista / 7 / Windows XP.  Requires
Two parameters to be sent.  The Zip file name (with .ZIP) and
A File / Folder

Send a Folder called C:\FolderA to a file in the current
folder called MYZIPFILE.ZIP


You must ALWAYS Specify an EXPLICIT path to the ZIP file

Send a File called FILE.TXT in C:\FOLDER to a
ZIP file called TEMPZIPFILE.ZIP in the C:\TEMP Folder


You must ALWAYS Specify an EXPLICIT path to the ZIP file

This will FAIL – Consider it a flaw in design :)


This was originally a VB.Net Function written by Steve Fulton
from a post on MSDN.COM

Converted to Powershell by Sean Kearney @energizedtech (www.powershell.ca)


# The $zipHeader variable contains all the data that needs to sit on the top of the
# Binary file for a standard .ZIP file
$zipHeader=[char]80 + [char]75 + [char]5 + [char]6 + [char]0 + [char]0 + [char]0 + [char]0 + [char]0 + [char]0 + [char]0 + [char]0 + [char]0 + [char]0 + [char]0 + [char]0 + [char]0 + [char]0 + [char]0 + [char]0 + [char]0 + [char]0

# Check to see if the Zip file exists, if not create a blank one
If ( (TEST-PATH $zipfilename) -eq $FALSE ) { Add-Content $zipfilename -value $zipHeader }

# Create an instance to Windows Explorer’s Shell comObject
$ExplorerShell=NEW-OBJECT -comobject ‘Shell.Application’

# Send whatever file / Folder is specified in $filename to the Zipped folder $zipfilename

# Hey the cool part is if you send a folder, it automatically recurses and gives you the
# Progress bar as it is zipping.
# Sean
# The Energized Tech
# www.powershell.ca



One thought on “Powershell – Send Files to a Compressed Folder

  1. Hey Sean-
    Thank you for this. It works, except not in a persistent connection to another machine – I assume this is because there is no GUI session available when connecting this way. Do you have any ideas how to run this on a remote machine in a persistent connection? Or even on the same machine you are using in a persistent connection?
    I would love for it to wait to continue the script until the ZIP file has been created completely. I have tried DotNetZip, but it seems to have issues with larger files. My next shot is 7-Zip, but I’d rather use something like what you have made since it is more native.
    Thanks again! Let me know if you have any questions for me.