A script that allows adding custom paper sizes in (forms) through Printer Server Manager for Microsoft Print To PDF virtual printer

MSPrintToPDF_AllowCustomSizes.ps1

# Adds custom paper sizes to Windows 10 'Microsoft print to PDF' virtual printer.
# Based on instructions from:
# https://answers.microsoft.com/en-us/windows/forum/windows_10-hardware/microsoft-print-to-pdf-custom-paper-sizes-possible/90ed3d48-1ece-4ca5-8d3b-ff0af24a7b37?auth=1
# https://franklinheath.co.uk/2015/08/29/custom-page-sizes-for-microsoft-print-to-pdf/
# https://onedrive.live.com/?authkey=%21ABebdrLzeOY7sa4&cid=A34A14B10D9BB9A1&id=A34A14B10D9BB9A1%21854&parId=A34A14B10D9BB9A1%21838&o=OneUp


# This allows to use custom size forms.
# https://technet.microsoft.com/en-us/library/dd759110(v=ws.11).aspx
$GPDCustomSizeMatch = '*DefaultOption: LETTER'
$GPDCustomSizeInsert = (
'*Option: CUSTOMSIZE
{
*rcNameID: =USER_DEFINED_SIZE_DISPLAY
*MinSize: PAIR(180000, 180000)
*MaxSize: PAIR(30276000 , 42804000)
*MaxPrintableWidth: 30276000
}')

function InsertText {
    # Function for inserting content into text files.
    # 'file' is path to file
    # 'match' is a line to add text after
    # 'conent' text to add
    Param ($filepath, $match, $content)
    
        $NewContent = Get-Content -Path $filepath |
        ForEach-Object {
            if($_ -match ('^' + $match))
            {
                $_
                $content 
            }
            else
            {
                $_
            }
        }
        $NewContent | Out-File -FilePath $filepath -Encoding Default -Force
}


# Gets the location of the printer configuration folder.
$printerKey = 'HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Print\Printers\Microsoft Print to PDF'
$printerGuid = (Get-ItemProperty -Path $printerKey -Name 'PrintQueueV4DriverDirectory').PrintQueueV4DriverDirectory
$printerPath = $env:windir + "\System32\spool\V4Dirs\" + $printerGuid


# Creates a backup of all files in folder.
$date = Get-Date -Format FileDateTime
$backupDestination = $printerPath + " " + $date +".zip"
Add-Type -assembly "system.io.compression.filesystem"
[io.compression.zipfile]::CreateFromDirectory($printerPath, $backupDestination)


# Folder clean up.
Remove-Item ($printerPath + "\merged.gpd") -ErrorAction SilentlyContinue
Remove-Item ($printerPath + "\*.bud") -ErrorAction SilentlyContinue
Remove-Item ($printerPath + "\gpc.xml") -ErrorAction SilentlyContinue


# Gets the GPD printer configuration file.
$GPDKey = 'HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Print\Printers\Microsoft Print to PDF\PrinterDriverData'
$configFileName = (Get-ItemProperty -Path $GPDKey -Name 'V4_Merged_ConfigFile_Name').V4_Merged_ConfigFile_Name
$GPDFilepath = $printerPath + '\' + $configFileName


InsertText $GPDFilepath $GPDCustomSizeMatch $GPDCustomSizeInsert

tried this on windows 10, but doesn't seem to work, breaks printer preferences
any ideas why?

@lin-ycv: No ideas. Any errors? Can you try adding a paper size manually using steps in this script? I'm not sure if this method is even up to date, as this script is 5 years old.