Sets registry keys to all users present on the computer, including current and default user

SetAllUsersRegistryFromRegFile.ps1

#requires -RunAsAdministrator

param (
    [Parameter(Mandatory)]
    $Path)
 
$ErrorActionPreference = 'stop'
if (-not (Test-Path $Path)) {throw "Path $Path does not exist!" }

# import it for current user
$Path = Resolve-Path $Path
reg.exe import $Path


$content = Get-Content $Path

$file = Join-Path $env:temp ((New-Guid).ToString('N') + '.reg')

# import it for new users
$updatedContent = $content -replace '\[(-?)HKEY_CURRENT_USER', "[`$1HKEY_USERS\.DEFAULT"
Set-Content -Value $updatedContent -Path $file -Force
reg.exe import $file

# import it for all other users
$mountedHive = 'HKEY_USERS\mounted'
$updatedContent = $content -replace '\[(-?)HKEY_CURRENT_USER', "[`$1$mountedHive"

Set-Content -Value $updatedContent -Path $file -Force
Get-Item C:\users\*\ntuser.dat -Force | % FullName | 
    ? { $_ -notlike "*\users\$($env:USERNAME)\*" } | 
    foreach {
        try {
            "Writing $_"
            reg.exe load $mountedHive $_
            reg.exe import $file
            reg.exe unload $mountedHive
        } catch { 
            $ErrorActionPreference = 'continue'
            Write-Error $_
        }
    }

Remove-Item $file -Force