Retrieving the List of Installed Programs in Windows 7

The Programs and Features view in the Windows Control Panel does not provide a means to export the list of installed programs as a text file.

A quick web search brought up the information that the information about installed software resides under the registry key

HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall

or, on 64-bit systems, under

HKLM:\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall

(Source: social technet, Scripting Guy, HowToGeek, SuperUser)

PowerShell kann enumerate the information under these keys using the Get-ItemProperty commandlet. You can retrieve the PS properties of this data using the Get-Member commandlet.

So the first PS command to retrieve this list is

Get-ItemProperty HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall\*

However, Control Panel does not display the registry entry if

  • its DisplayName is empty or not set
  • its UninstallString is empty or not set

which results in the command

Get-ItemProperty HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall\* | 
where-object {$_.DisplayName -and $_.UninstallString }

To retrieve the programs directly in PowerShell ISE, we can simply use the Format-Table commandlet

Get-ItemProperty HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall\* | 
Where-Object {$_.DisplayName -and $_.UninstallString } | 
Select-Object Publisher, DisplayName, DisplayVersion, InstallLocation, InstallDate, URLInfoAbout, UninstallString | 
Sort-Object Publisher,DisplayName | 
Format-Table

To output to a file for further processing in Excel, export to a .csv file like this

Get-ItemProperty HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall\* | 
Where-Object {$_.DisplayName -and $_.UninstallString } | 
Select-Object Publisher, DisplayName, DisplayVersion, InstallLocation, InstallDate, URLInfoAbout, UninstallString | 
Sort-Object Publisher,DisplayName | 
Export-Ssv -delimiter "`t" -encoding "unicode" c:\temp\installed.csv

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