Bad file handler when trying to save PDFs

Here is a temporary fix (hoping Windows 11 updates to resolve this issue). Run this powershell script (admin mode) on your PC. It will basically safelist all locations so that File Explorer will not block the PDF(s) from being previewed. If you are afraid of running the script, I recommend running it thru AI and asking for a break down of what exactly it's doing:

# Allow previews for files marked Internet Zone (ZoneId=3)

$paths = @(
"HKCU:\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3",
"HKLM:\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3",
"HKCU:\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Lockdown_Zones\3",
"HKLM:\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Lockdown_Zones\3"
)

foreach ($path in $paths) {
# Ensure the key exists
if (-not (Test-Path $path)) {
New-Item -Path $path -Force | Out-Null
}

# Set 180F = 0 (DWORD)
New-ItemProperty -Path $path -Name "180F" -Value 0 -PropertyType DWord -Force | Out-Null
}

Hi there 

Hope you are doing well and sorry for the trouble. 

Is this an issue with all the PDFs or with a specific PDF file? Please try with a different PDF file and check.

Also, update the Acrobat application to the latest version 25.01.20997 Go to Help > Check for updates and reboot the computer once. 

You may also check the steps shared in the correct answer marked in the similar discussion https://adobe.ly/4pCwlN8 and see if that helps. 

Let us know how it goes.

~Amal