Export remote registry in the same fashion as RegEdit's export function. In reply to https://www.reddit.com/r/PowerShell/comments/7bht8c/exporting_registries/

ExportRegistry.ps1

function Export-Registry {
    Param (
        $ComputerName = "iis",
        $Key = "hklm\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall",
        $LocalPath = "."
    )

    $DateText = (Get-Date -Format s) -replace ':', '-'
    $FileName = "$DateText-$ComputerName.reg"

    $RemoteScript = {
        Param (
            [String]$Key,
            [String]$FileName
        )
        & reg.exe export "$Key" "$env:TEMP\$FileName" | Out-Null
        Write-Output $env:TEMP
    }

    $RemotePath = Invoke-Command -ComputerName $ComputerName -ScriptBlock $RemoteScript -ArgumentList @($Key, $FileName)

    Copy-Item "$( $RemotePath -replace '^(\w):', "\\$ComputerName\`$1`$" )\$FileName" "$LocalPath\$FileName"
}