С некоторой помощью друга мне удалось найти решение.
$ErrorActionPreference = "Stop"
$root = "P:\A N G"
$excelFiles = Get-ChildItem -path $root -File "*.xlsx" -Recurse
foreach ($excelFile in $excelFiles.FullName)
{
$excel = New-Object -ComObject Excel.Application
$excelWorkBook = $excel.Workbooks.Open($excelFile)
if (!$excelWorkBook.MultiUserEditing)
{
Write-Host $excelWorkBook.FullName
$accessMode = [Microsoft.Office.Interop.Excel.XlSaveAsAccessMode]::xlShared
$xlFixedFormat = [Microsoft.Office.Interop.Excel.XlFileFormat]::xlWorkbookDefault
$excelWorkBook.SaveAs($excelWorkBook.FullName,$xlFixedFormat,$null,$null,$null,$null,$accessMode,$null,$null,$null,$null,$null)
$excelWorkBook.Close
}
}
[System.Runtime.Interopservices.Marshal]::ReleaseComObject($excel)