private/Test-Install7Zip.ps1
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function Test-Install7Zip { <# .SYNOPSIS Tests whether 7-Zip is installed .DESCRIPTION Checks for 7z.exe in the default 64-bit and 32-bit installation paths. If neither file exists, searches the machine uninstall registry for a display name beginning with 7-Zip. Returns $true when any check finds an installation; otherwise, returns $false. .EXAMPLE PS> Test-Install7Zip Tests the default paths and uninstall registry for 7-Zip. .INPUTS None. This function does not accept pipeline input. .OUTPUTS System.Boolean. Returns $true when 7-Zip is detected; otherwise, returns $false. .NOTES Author: David Segura Company: Recast Software Version: 1.0.0 Date: 2026-08-28 #> [OutputType([bool])] param () # Fast path — default install location $defaultPaths = @( (Join-Path $env:ProgramFiles '7-Zip\7z.exe'), (Join-Path ${env:ProgramFiles(x86)} '7-Zip\7z.exe') ) foreach ($path in $defaultPaths) { if (Test-Path -Path $path) { return $true } } # Registry fallback $regPaths = @( 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\*', 'HKLM:\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall\*' ) foreach ($regPath in $regPaths) { $entry = Get-ItemProperty -Path $regPath -ErrorAction SilentlyContinue | Where-Object { $_.PSObject.Properties['DisplayName'] -and $_.DisplayName -like '7-Zip*' } | Select-Object -First 1 if ($entry) { return $true } } return $false } |