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Chocolatey Core Extensions


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This package was approved as a trusted package on 2/23/2017.

This package provides helper functions installed as a Chocolatey extension.
These functions may be used in Chocolatey install/uninstall scripts by declaring this package a dependency in your package's nuspec.

To install Chocolatey Core Extensions, run the following command from the command line or from PowerShell:

C:\> choco install chocolatey-core.extension --version 1.1.0

To upgrade Chocolatey Core Extensions, run the following command from the command line or from PowerShell:

C:\> choco upgrade chocolatey-core.extension --version 1.1.0


  • extensions\chocolatey-core.psm1 Show
    # Export functions that start with capital letter, others are private
    # Include file names that start with capital letters, ignore others
    $ScriptRoot = Split-Path $MyInvocation.MyCommand.Definition
    $pre = ls Function:\*
    ls "$ScriptRoot\*.ps1" | ? { $_.Name -cmatch '^[A-Z]+' } | % { . $_  }
    $post = ls Function:\*
    $funcs = compare $pre $post | select -Expand InputObject | select -Expand Name
    $funcs | ? { $_ -cmatch '^[A-Z]+'} | % { Export-ModuleMember -Function $_ }
    #Export-ModuleMember -Alias *
  • extensions\Get-AppInstallLocation.ps1 Show
        Get application install location
        Function tries to find install location in multiple places. It returns $null if all fail. The following
        locations are tried:
          - local and machine (x32 & x64) various Uninstall keys
          - x32 & x64 Program Files up to the 2nd level of depth
          - native commands available via PATH
          - locale and machine registry key SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths
        Use Verbose parameter to see which of the above locations was used for the result, if any.
        PS> Get-AppInstallLocation choco
        Returns the install location of the application 'choco'.
        [String] or $null
    function Get-AppInstallLocation {
            # Regular expression pattern
            [string] $AppNamePattern
        function strip($path) { if ($path.EndsWith('\')) { return $path -replace '.$' } else { $path } }
        $ErrorActionPreference = "SilentlyContinue"
        Write-Verbose "Trying local and machine (x32 & x64) Uninstall keys"
        [array] $key = Get-UninstallRegistryKey $AppNamePattern
        if ($key.Count -eq 1) {
            Write-Verbose "Trying Uninstall key property 'InstallLocation'"
            $location = $key.InstallLocation
            if ($location -and (Test-Path $location))  { return strip $location }
            Write-Verbose "Trying Uninstall key property 'UninstallString'"
            $location = $key.UninstallString
            if ($location) { $location = $location.Replace('"', '') | Split-Path $location }
            if ($location -and (Test-Path $location))  { return strip $location }
            Write-Verbose "Trying Uninstall key property 'DisplayIcon'"
            $location = $key.DisplayIcon
            if ($location) { $location = Split-Path $location }
            if ($location -and (Test-Path $location))  { return strip $location }
        } else { Write-Verbose "Found $($key.Count) keys, aborting this method" }
        $dirs = $Env:ProgramFiles, "$Env:ProgramFiles\*\*"
        if (Get-ProcessorBits 64) { $dirs += ${ENV:ProgramFiles(x86)}, "${ENV:ProgramFiles(x86)}\*\*" }
        Write-Verbose "Trying Program Files with 2 levels depth: $dirs"
        $location = (ls $dirs | ? {$_.PsIsContainer}) -match $AppNamePattern | select -First 1 | % {$_.FullName}
        if ($location -and (Test-Path $location))  { return strip $location }
        Write-Verbose "Trying native commands on PATH"
        $location = (Get-Command -CommandType Application) -match $AppNamePattern | select -First 1 | % { Split-Path $_.Source }
        if ($location -and (Test-Path $location))  { return strip $location }
        $appPaths =  "\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths"
        Write-Verbose "Trying Registry: $appPaths"
        $location = (ls "HKCU:\$appPaths", "HKLM:\$appPaths") -match $AppNamePattern | select -First 1
        if ($location) { $location = Split-Path $location }
        if ($location -and (Test-Path $location))  { return strip $location }
        Write-Verbose "No location found"
  • extensions\Get-AvailableDriveLetter.ps1 Show
      Get a 'free' drive letter
      Get a not yet in-use drive letter that can be used for mounting
      Get-AvailableDriveLetter 'X'
      (do not return X, even if it'd be the next choice)
      specific drive letter(s) that will be excluded as potential candidates
      System.String (single drive-letter character)
    function Get-AvailableDriveLetter {
      param ([char[]]$ExcludedLetters)
      $Letter = [int][char]'C'
      $i = @()
      #getting all the used Drive letters reported by the Operating System
      $(Get-PSDrive -PSProvider filesystem) | %{$i += $}
      #Adding the excluded letter
      while($i -contains $([char]$Letter)){$Letter++}
      if ($Letter -gt [char]'Z') {
        throw "error: no drive letter available!"
      Write-Verbose "available drive letter: '$([char]$Letter)'"
      Return $([char]$Letter)
  • extensions\Get-PackageCacheLocation.ps1 Show
        Get temporary location for the package based on its name and version.
        The function returns package cache directory within $Env:TEMP. It will not create the directory
        if it doesn't exist.
        This function is useful when you have to obtain the file using `Get-ChocolateyWebFile` in order
        to perform certain installation steps that other helpers can't do.
    function Get-PackageCacheLocation {
        param (
            # Name of the package, by default $Env:ChocolateyPackageName
            [string] $Name    = $Env:ChocolateyPackageName,
            # Version of the package, by default $Env:ChocolateyPackageVersion
            [string] $Version = $Env:ChocolateyPackageVersion
        if (!$Name) { Write-Warning 'Environment variable $Env:ChocolateyPackageName is not set' }
        $res = Join-Path $Env:TEMP $Name
        if (!$Version) { Write-Warning 'Environment variable $Env:ChocolateyPackageVersion is not set' }
        $res = Join-Path $res $Version
  • extensions\Get-PackageParameters.ps1 Show
        Parses parameters of the package
        Get-PackageParameters "/Shortcut /InstallDir:'c:\program files\xyz' /NoStartup" | set r
        if ($r.Shortcut) {... }
        Write-Host $r.InstallDir
    function Get-PackageParameters([string] $Parameters = $Env:ChocolateyPackageParameters) {
        $res = @{}
        $re = "\/([a-zA-Z0-9]+)(:([`"'])?([a-zA-Z0-9- _\\:\.]+)([`"'])?)?"
        $results = $Parameters | Select-String $re -AllMatches | select -Expand Matches
        foreach ($m in $results) {
            if (!$m) { continue } # must because of posh 2.0 bug:
            $a = $m.Value -split ':'
            $opt = $a[0].Substring(1); $val = $a[1..100] -join ':'
            if ($val -match '^(".+")|(''.+'')$') {$val = $val -replace '^.|.$'}
            $res[ $opt ] = if ($val) { $val } else { $true }
  • extensions\Get-UninstallRegistryKey.ps1 Show
        Retrieve registry key(s) for system-installed applications from an exact or wildcard search.
        This function will attempt to retrieve a matching registry key for an already installed application,
        usually to be used with a chocolateyUninstall.ps1 automation script.
        The function also prevents `Get-ItemProperty` from failing when handling wrongly encoded registry keys.
    .PARAMETER SoftwareName
        Part or all of the Display Name as you see it in Programs and Features.
        It should be enough to be unique.
        The syntax follows the rules of the PowerShell `-like` operator, so the `*` character is interpreted
        as a wildcard, which matches any (zero or more) characters.
        If the display name contains a version number, such as "Launchy (2.5)", it is recommended you use a
        fuzzy search `"Launchy (*)"` (the wildcard `*`) so if Launchy auto-updates or is updated outside
        of chocolatey, the uninstall script will not fail.
        Take care not to abuse fuzzy/glob pattern searches. Be conscious of programs that may have shared
        or common root words to prevent overmatching. For example, "SketchUp*" would match two keys with software
        names "SketchUp 2016" and "SketchUp Viewer" that are different programs released by the same company.
        [array]$key = Get-UninstallRegistryKey -SoftwareName "VLC media player"
        Exact match: software name in Programs and Features is "VLC media player"
        [array]$key = Get-UninstallRegistryKey -SoftwareName "Gpg4win (*)"
        Version match: software name is "Gpg4Win (2.3.0)"
        [array]$key = Get-UninstallRegistryKey -SoftwareName "SketchUp [0-9]*"
        Version match: software name is "SketchUp 2016"
        Note that the similar software name "SketchUp Viewer" would not be matched.
    function Get-UninstallRegistryKey {
            [Parameter(Mandatory=$true, ValueFromPipeline=$true)]
            [string] $SoftwareName
        Write-Debug "Running 'Get-UninstallRegistryKey' for `'$env:ChocolateyPackageName`' with SoftwareName:`'$SoftwareName`'";
        $ErrorActionPreference = 'Stop'
        $local_key       = 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Uninstall\*'
        $machine_key     = 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\*'
        $machine_key6432 = 'HKLM:\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\*'
        Write-Verbose "Retrieving all uninstall registry keys"
        [array]$keys = Get-ChildItem -Path @($machine_key6432, $machine_key, $local_key) -ea 0
        Write-Debug "Registry uninstall keys on system: $($keys.Count)"
        Write-Debug "Error handling check: `'Get-ItemProperty`' fails if a registry key is encoded incorrectly."
        [int]$maxAttempts = $keys.Count
        for ([int]$attempt = 1; $attempt -le $maxAttempts; $attempt++)
            $success = $false
            $keyPaths = $keys | Select-Object -ExpandProperty PSPath
            try {
                [array]$foundKey = Get-ItemProperty -Path $keyPaths -ea 0 | ? { $_.DisplayName -like $SoftwareName }
                $success = $true
            } catch {
                Write-Debug "Found bad key."
                foreach ($key in $keys){ try{ Get-ItemProperty $key.PsPath > $null } catch { $badKey = $key.PsPath }}
                Write-Verbose "Skipping bad key: $badKey"
                [array]$keys = $keys | ? { $badKey -NotContains $_.PsPath }
            if ($success) { break; }
            if ($attempt -eq 10) {
                Write-Warning "Found more than 10 bad registry keys. Run command again with `'--verbose --debug`' for more info."
                Write-Debug "Each key searched should correspond to an installed program. It is very unlikely to have more than a few programs with incorrectly encoded keys, if any at all. This may be indicative of one or more corrupted registry branches."
        Write-Debug "Found $($foundKey.Count) uninstall registry key(s) with SoftwareName:`'$SoftwareName`'";
        return $foundKey
  • extensions\Get-WebContent.ps1 Show
      Download file with choco internals
      This function will download a file from specified url and return it as a string.
      This command should be a replacement for ubiquitous WebClient in install scripts.
      The benefit of using this command instead of WebClient is that it correctly handles
      system or explicit proxy.
      PS C:\> $s = Get-WebContent ""
      PS C:\> $s -match 'Example Domain'
      First command downloads html content from and stores it in $s.
      Now you can parse and match it as a string.
      PS C:\> $opts = @{ Headers = @{ Referer = '' } }
      PS C:\> $s = Get-WebContent -url "" -options $opts
      You can set headers for http request this way.
      This function can only return string content.
      If you want to download a binary content, please use Get-WebFile.
    function Get-WebContent {
            # Url to download
            # Additional options for http request.For now only Headers property supported.
        $filePath =  get_temp_filepath
        Get-WebFile -Url $Url -FileName $filePath -Options $Options 3>$null
        $fileContent = Get-Content $filePath -ReadCount 0 | Out-String
        Remove-Item $filePath
    function get_temp_filepath() {
        $tempDir = Get-PackageCacheLocation
        $fileName = [System.IO.Path]::GetRandomFileName()
        Join-Path $tempDir $fileName
  • extensions\Register-Application.ps1 Show
        Register application in the system
        The function will register application in the system using App Paths registry key so that you
        can start it by typing its registred name in the Windows Start menu on using run dialog (Win + R).
        To make applications available in the shell, add to your profile Set-AppKeyAliases function.
        Register-Application 'c:\windows\notepad.exe'
        Register application using name derived from its file name.
        Register-Application 'c:\windows\notepad.exe' -Name ntp
        Register application using explicit name.
       Set-AppKeyAliases        -
       Application Registration -
    function Register-Application{
            # Full path of the executable to register.
            # Optional name to register with. By default exe name will be used.
            # Register application only for the current user. By default registration is for the machine.
        if (!(Test-Path $ExePath)) { throw "Path doesn't exist: $ExePath" }
        if (!$Name) { $Name = Split-Path $ExePath -Leaf } else { $Name = $Name + '.exe' }
        $appPathKey = "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\$Name"
        if ($User) { $appPathKey = "HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\$Name" }
        If (!(Test-Path $AppPathKey)) { New-Item "$AppPathKey" | Out-Null }
        Set-ItemProperty -Path $AppPathKey -Name "(Default)" -Value $ExePath

Virus Scan Results

In cases where actual malware is found, the packages are subject to removal. Software sometimes has false positives. Moderators do not necessarily validate the safety of the underlying software, only that a package retrieves software from the official distribution point and/or validate embedded software against official distribution point (where distribution rights allow redistribution).

Chocolatey Pro provides runtime protection from possible malware.


This package has no dependencies.

Package Maintainer(s)

Software Author(s)

  • chocolatey


© 2016 Chocolatey Core Team Package Contributors


Release Notes

Version History

Version Downloads Last updated Status
Chocolatey Core Extensions 1.3.2 18606 Tuesday, October 10, 2017 approved
Chocolatey Core Extensions 1.3.1 1512787 Tuesday, May 23, 2017 approved
Chocolatey Core Extensions 1.3.0 325771 Friday, April 21, 2017 approved
Chocolatey Core Extensions 1.2.0 380074 Monday, March 20, 2017 approved
Chocolatey Core Extensions 1.1.0 224179 Thursday, February 23, 2017 approved
Chocolatey Core Extensions 1.0.7 199640 Monday, February 13, 2017 approved
Chocolatey Core Extensions 1.0.6 111464 Wednesday, February 1, 2017 approved
Chocolatey Core Extensions 1.0.5 82103 Tuesday, January 24, 2017 approved
Chocolatey Core Extensions 1.0.4 329049 Monday, December 12, 2016 approved
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