Get-ProcessHandle.ps1

function Get-ProcessHandle {
<#
.SYNOPSIS
    Get all the currently open handles of a process
    NOTE: requires the handle.exe tool from Sysinternals
.EXAMPLE
    Get-ProcessHandle -PID 12000 -IncludeMode
#>

[cmdletbinding()]
[OutputType('Sysinternals.Thread.Handle')]  # <-- just a custom psobject type
param(
    [Parameter(Mandatory=$true)]
    [int]$Id,
    [switch]$IncludeMode                    # <-- requires admin rights to work
)

try {handle.exe -? *>$null} catch {throw 'Handle.exe was not found'}

if ($IncludeMode.IsPresent) {
    $CurrentId = [Security.Principal.WindowsIdentity]::GetCurrent()
    $AdminRole = [Security.Principal.WindowsBuiltinRole]::Administrator
    $IsAdmin   = [Security.Principal.WindowsPrincipal]::new($CurrentId).IsInRole($AdminRole)
    if (-not $IsAdmin) {Write-Warning 'IncludeMode requires Admin privileges to work';return}
}
# NOTE: unfortunately can't use #requires -RunAsAdministrator cause it applies globally anyhow

try   {$proc = Get-Process -Id $Id -ErrorAction Stop}
catch {Write-Warning "Could not get process with ID $Id"; throw $_}

$rgx = '^\s*([0-9A-F]+):\s(\w+)\s+(\([RWD-]+\))?\s*(.+)$'
if ($IncludeMode.IsPresent) {$cmd = "handle.exe -p $Id -u -nobanner"}
else                        {$cmd = "handle.exe -p $Id -nobanner"}

Invoke-Expression $cmd | foreach {
    $find = [regex]::Match($_,$rgx)
    if ($find.Success) {
        if ($IncludeMode.IsPresent) {
            $Mode = $find.Groups[3].Value
            $Mode = [char[]]$Mode | foreach {
                switch ($_) {
                    'R' {'Read'}
                    'W' {'Write'}
                    'D' {'Delete'}
                } #switch
            } #foreach
        } #if mode
        else {$Mode = 'N/A'}

        $obj = [PSCustomObject] @{
            PSTypeName = 'Sysinternals.Thread.Handle'
            Name       = $proc.Name
            ProcessID  = $proc.Id
            HandleID   = $find.Groups[1].Value
            HandleType = $find.Groups[2].Value
            HandlePath = $find.Groups[4].Value
            Mode       = $Mode
        } #psobject
        $Def   = 'ProcessID','HandleID','HandleType','HandlePath'
        $Class = [Management.Automation.PSPropertySet]
        $DDPS  = $Class::new('DefaultDisplayPropertySet',[string[]]$Def)
        $Std   = [Management.Automation.PSMemberInfo[]]@($DDPS)
        $obj | Add-Member MemberSet PSStandardMembers $std -PassThru  # <-- this is the output
    } #if find
} #foreach handle
}