How to convert a .doc to .pdf with field lock via powershell - pdf

Question

I am looking to convert all .doc documents that end up in a specific folder. This part I have covered (see below code). The issue that I am having is there is a field that is inside of the document itself that breaks every time you try to save the document as a different file type. If you highlight the field and lock it (CRTL + F11) then save works like a champ. If you have any ideas at all please let me know. I am willing to try anything out at this point in time.
$wdFormatPDF = 17
$word = New-Object -ComObject word.application
$word.visible = $false
$folderpath = "c:\test\*"
$fileTypes = "*.doc"
Get-ChildItem -path $folderpath -include $fileTypes |
foreach-object `
{
$path = ($_.fullname).substring(0,($_.FullName).lastindexOf("."))
"Converting $path to pdf ..."
$doc = $word.documents.open($_.fullname)
$doc.saveas([ref] $path, [ref]$wdFormatPDF)
$doc.close()
}
$word.Quit()

Answer 1

After you grab the filename and remove extension you didn't append .pdf to to it.
$path = ($_.fullname).substring(0,($_.FullName).lastindexOf("."))
"Converting $path to pdf ..."
You are missing this line
$path = $path + ".pdf"
## $doc = $word.documents.open($_.fullname)
$doc.saveas([ref] $path, [ref]$wdFormatPDF)
If that doesn't help then $doc has Fields.Locked Property which you set it to True or False.
$doc.Fields.Locked = $true