Save unsaved files

Question

I need to save all open Excel, Word, and PowerPoint documents to a temp directory(C:\temp\), regardless if they have ever been saved or not.  The saved file will be the "CurrentDocumentTitle + Timestamp".Extension.  I can use WASP
to pull all open workbooks/documents in Excel, Word, and PowerPoint.  I can get A file to save, but it contains no content (at least unreadable).  I cannot seem to get this to work correctly, and I'm really hoping that this can be accomplished using
PowerShell.  The intent of this is to be able to run an Acrobat uninstaller across multiple systems in my domain using SCCM.  I'm asking the users to save their work and close their applications so the uninstaller can run, unfortunately, they are
not acting accordingly.  Any help would greatly be appreciated.
Set-ExecutionPolicy unrestricted -force
import-module C:\temp\WASP\WASP.dll -force #location of WASP
Function logstamp {
    $now=get-Date
    $yr = $now.Year.ToString()
    $mo = $now.Month.ToString()
    $dy = $now.Day.ToString()
    $hr = $now.Hour.ToString()
    $mi = $now.Minute.ToString()
    $se = $now.Second.ToString()
    if ($mo.length -lt 2) {
        $mo = "0" + $mo
    if ($dy.length -lt 2) {
        $dy = "0" + $dy
    if ($hr.length -lt 2) {
        $hr = "0" + $hr
    if ($mi.length -lt 2) {
        $mi = "0" + $mi
    if ($se.length -lt 2) {
        $se = "0" + $se
    write-output $yr$mo$dy$hr$mi$se
$logstamp = logstamp
$filepath = "C:\temp\"
$objects = Select-Window | Where-Object {$_.Title -like "*Excel" -or $_.Title -like "*Word" -or $_.Title -like "*PowerPoint"} #SEARCHES FOR ALL OPEN WINDOWS OF LISTED TYPES (SAVED OR UNSAVED)
foreach($file in $objects){
    If ($file.Title -like "*Excel"){ #Set extension for Excel
        $ext = ".xlsx"
        #$a = New-Object -comobject Excel.Application
        #$a.Visible = $true
        #$book = $a.Workbooks.open($file)
        #$book.Save($filepath + $file.Title + $logstamp + $ext)
        #$a.Quit()
    Elseif ($file.Title -like "*Word"){ #Set extension for Word
        $ext = ".docx"
    Elseif ($file.Title -like "*PowerPoint"){ #Set extension for PowerPoint
        $ext = ".pptx"
    $ofile = out-file ($filepath + $file.Title + $logstamp + $ext)
$ofile

Answer 1

When I ran it on my system with the where $_.processname it showed every open workbook:
ProcessName : EXCEL
ProcessId : 4440
IsActive : False
Handle : 66246
Title : Microsoft Excel - 192.168.82-SubnetInfo.csv
Class : XLMAIN
ProcessName : EXCEL
ProcessId : 4440
IsActive : False
Handle : 1116514
Title : 192.168.82-SubnetInfo.csv
Class : MS-SDIb
ProcessName : EXCEL
ProcessId : 4440
IsActive : False
Handle : 334352
Title : DHCP for JnJ IP Ranges - NA.xlsx
Class : MS-SDIb
ProcessName : EXCEL
ProcessId : 4440
IsActive : False
Handle : 1120668
Title : 1Synthes_IP_Renumbering_tracker_9 15.xls [Protected View] [Compatibility Mode]
Class : MS-SDIb
ProcessName : EXCEL
ProcessId : 4440
IsActive : False
Handle : 462498
Title : Synthes US - New VLAN.xlsx
Class : MS-SDIb
In your section of code for Excel and for the other files, unless the file is in the same path as the script you'll never touch it.  And even then you'll only be touching the version before the user has made any edits.  The only way you can take
action on the existing, open, edited, unsaved version of the file that I'm aware of is to use the 
[Runtime.Interopservices.Marshal]::GetActiveObject
Method.
I hope this post has helped!