PowerShell Function to Set-RegistryValueForAllUsers

Below is a PowerShell function that sets a registry value for all users on a Windows machine. This function will iterate through all user profiles and set the specified registry value.

function Set-RegistryValueForAllUsers {
    param (
        [Parameter(Mandatory = $true)]
        [string]$RegistryPath,

        [Parameter(Mandatory = $true)]
        [string]$ValueName,

        [Parameter(Mandatory = $true)]
        [string]$ValueData,

        [Parameter(Mandatory = $false)]
        [Microsoft.Win32.RegistryValueKind]$ValueType = [Microsoft.Win32.RegistryValueKind]::String
    )

    # Get all user profiles
    $userProfiles = Get-WmiObject -Class Win32_UserProfile | Where-Object { $_.Special -eq $false }

    foreach ($profile in $userProfiles) {
        $userHive = "HKEY_USERS\$($profile.SID)"
        $fullRegistryPath = "$userHive\$RegistryPath"

        try {
            # Create the registry key if it doesn't exist
            if (-not (Test-Path -Path $fullRegistryPath)) {
                New-Item -Path $fullRegistryPath -Force | Out-Null
            }

            # Set the registry value
            Set-ItemProperty -Path $fullRegistryPath -Name $ValueName -Value $ValueData -Type $ValueType
            Write-Output "Successfully set $ValueName to $ValueData for user $($profile.LocalPath)"
        } catch {
            Write-Error "Failed to set $ValueName for user $($profile.LocalPath): $_"
        }
    }
}

# Example usage:
# Set-RegistryValueForAllUsers -RegistryPath "Software\MyApp" -ValueName "MySetting" -ValueData "MyValue"

Explanation:

• Parameters:
  • RegistryPath: The path to the registry key relative to the user hive.
  • ValueName: The name of the registry value to set.
  • ValueData: The data to set for the registry value.
  • ValueType: The type of the registry value (default is String).
• Process:
  • Retrieves all user profiles using Get-WmiObject.
  • Iterates through each user profile and constructs the full registry path.
  • Checks if the registry key exists; if not, it creates it.
  • Sets the specified registry value for each user profile.