PowerShell 7.6+ demo to extract an icon with all native and custom sizes

import-icon.ps1

# Windows Powershell doesn't have [System.Drawing.Icon]::ExtractIcon method
# Neither ExtractIcon* functions from user32.dll have a parameter associated with size
Add-Type -AssemblyName System.Drawing
$Path = 'C:\windows\system32\WindowsPowerShell\v1.0\PowerShell.exe'

function import-icon ([string]$file, [int]$index=0, [int[]]$sizes) {
	#if ([version]'7.6' -gt $PSVersionTable.PSVersion) {return}
	if (-not $file) {return} # -or -not (Test-Path $file -ErrorAction 0)
	if ($sizes.count) { # normalize sizes
		$sizes = @($sizes | Where-Object {$_ -gt 7 -and $_ -lt 257} | Sort-Object -Unique)
	}
	# auto sizing: mix of native and custom, all possible
	if (-not $sizes.count) {$sizes = 16,20,24,32,40,48,64,72,96,128,192,256}

	if ($index -lt 0) { # auto indexing
		$index = 0
		do { # till extraction error; possible false positive
			$icon = [System.Drawing.Icon]::ExtractIcon($file,$index)
			if ($icon) {
				import-icon $file $index $sizes
				$icon.Dispose()
			}
			$index++
		} while ($null -ne $icon)
		return
	}

	$group = 0 # primary key
	foreach ($s in $sizes) {
		$icon = [System.Drawing.Icon]::ExtractIcon($file,$index,$s)
		if ($null -eq $icon) {continue}
		[pscustomobject]@{
			Handle     = $icon.Handle
			Index      = $index
			GroupIndex = $group
			Id         = $index + 1
			GroupId    = '' # how to obtain it via PS? noway
			Icon       = $icon
		}
		$group++
	}
} # END import-icon

import-icon $Path | ft

  Handle Index GroupIndex Id GroupId Icon
  ------ ----- ---------- -- ------- ----
56494247     0          0  1         (Icon)
56559783     0          1  1         (Icon)
56625319     0          2  1         (Icon)
56690855     0          3  1         (Icon)
56756391     0          4  1         (Icon)
56821927     0          5  1         (Icon)
56887463     0          6  1         (Icon)
15861933     0          7  1         (Icon)
57018535     0          8  1         (Icon)
15993005     0          9  1         (Icon)
57149607     0         10  1         (Icon)
57215143     0         11  1         (Icon)