Various untested trick to prevent edge from hijacking the PDF viewer

UnPDFEdge.Ps1

# Stops edge from taking over as the default .PDF viewer    

Write-Output "Stopping Edge from taking over as the default .PDF viewer"

# Identify the edge application class 
$Packages = "HKCU:SOFTWARE\Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppModel\Repository\Packages" 
$edge = Get-ChildItem $Packages -Recurse -include "MicrosoftEdge" 

# Specify the paths to the file and URL associations 
$FileAssocKey = Join-Path $edge.PSPath Capabilities\FileAssociations 
$URLAssocKey = Join-Path $edge.PSPath Capabilities\URLAssociations 

# Get the software classes for the file and URL types that Edge will associate 
$FileTypes = Get-Item $FileAssocKey 
$URLTypes = Get-Item $URLAssocKey 
$FileAssoc = Get-ItemProperty $FileAssocKey 
$URLAssoc = Get-ItemProperty $URLAssocKey 
		
$Associations = @() 
$Filetypes.Property | foreach {$Associations += $FileAssoc.$_} 
$URLTypes.Property | foreach {$Associations += $URLAssoc.$_} 
		
# Add registry values in each software class to stop edge from associating as the default 
foreach ($Association in $Associations) { 
	$Class = Join-Path HKCU:SOFTWARE\Classes $Association 
	#if (Test-Path $class) 
	#   {write-host $Association} 
	# Get-Item $Class 
	Set-ItemProperty $Class -Name NoOpenWith -Value "" 
	Set-ItemProperty $Class -Name NoStaticDefaultVerb -Value "" 
} 




<#eedgepdf#>
Write-Output "Setting Edge back to default to takeover as default .PDF viewer..."
New-PSDrive  HKCR -PSProvider Registry -Root HKEY_CLASSES_ROOT
$ErrorActionPreference = 'SilentlyContinue'
$NoPDF = "HKCR:\.pdf"
$NoProgids = "HKCR:\.pdf\OpenWithProgids"
$NoWithList = "HKCR:\.pdf\OpenWithList"
#Sets edge back to default
If (Get-ItemProperty $NoPDF  NoOpenWith) {
	Remove-ItemProperty $NoPDF  NoOpenWith
} 
If (Get-ItemProperty $NoPDF  NoStaticDefaultVerb) {
	Remove-ItemProperty $NoPDF  NoStaticDefaultVerb 
}       
If (Get-ItemProperty $NoProgids  NoOpenWith) {
	Remove-ItemProperty $NoProgids  NoOpenWith 
}        
If (Get-ItemProperty $NoProgids  NoStaticDefaultVerb) {
	Remove-ItemProperty $NoProgids  NoStaticDefaultVerb 
}        
If (Get-ItemProperty $NoWithList  NoOpenWith) {
	Remove-ItemProperty $NoWithList  NoOpenWith
}    
If (Get-ItemProperty $NoWithList  NoStaticDefaultVerb) {
	Remove-ItemProperty $NoWithList  NoStaticDefaultVerb
}
        
#Removes an underscore '_' from the Registry key for Edge
$Edge2 = "HKCR:\AppXd4nrz8ff68srnhf9t5a8sbjyar1cr723_"
If (Test-Path $Edge2) {
	Set-Item $Edge2 AppXd4nrz8ff68srnhf9t5a8sbjyar1cr723
}
Write-Output "Operation Complete: Edge will now be able to be used for .PDF files."

<#dedgepdf#>
Write-Output "Stopping Edge from taking over as the default .PDF viewer..."
$ErrorActionPreference = 'SilentlyContinue'
$NoPDF = "HKCR:\.pdf"
$NoProgids = "HKCR:\.pdf\OpenWithProgids"
$NoWithList = "HKCR:\.pdf\OpenWithList" 
If (!(Get-ItemProperty $NoPDF  NoOpenWith)) {
	New-ItemProperty $NoPDF NoOpenWith 
}        
If (!(Get-ItemProperty $NoPDF  NoStaticDefaultVerb)) {
	New-ItemProperty $NoPDF  NoStaticDefaultVerb 
}        
If (!(Get-ItemProperty $NoProgids  NoOpenWith)) {
	New-ItemProperty $NoProgids  NoOpenWith 
}        
If (!(Get-ItemProperty $NoProgids  NoStaticDefaultVerb)) {
	New-ItemProperty $NoProgids  NoStaticDefaultVerb 
}        
If (!(Get-ItemProperty $NoWithList  NoOpenWith)) {
	New-ItemProperty $NoWithList  NoOpenWith
}        
If (!(Get-ItemProperty $NoWithList  NoStaticDefaultVerb)) {
	New-ItemProperty $NoWithList  NoStaticDefaultVerb 
}
            
#Appends an underscore '_' to the Registry key for Edge
$Edge = "HKCR:\AppXd4nrz8ff68srnhf9t5a8sbjyar1cr723_"
If (Test-Path $Edge) {
	Set-Item $Edge AppXd4nrz8ff68srnhf9t5a8sbjyar1cr723_ 
}
Write-Output "Operation Complete: Edge should no longer take over as the default .PDF files."