diff --git a/scripts/02-software.ps1 b/scripts/02-software.ps1
index 3385db3..a74af8b 100644
--- a/scripts/02-software.ps1
+++ b/scripts/02-software.ps1
@@ -142,6 +142,11 @@ if (Get-Feature $Config "software" "pdfDefault") {
     } else {
         Write-Log "  Found: $acroExe" -Level INFO
 
+        # Mount HKCR PSDrive - not available by default in PS sessions
+        if (-not (Get-PSDrive -Name HKCR -ErrorAction SilentlyContinue)) {
+            New-PSDrive -Name HKCR -PSProvider Registry -Root HKEY_CLASSES_ROOT | Out-Null
+        }
+
         # Set file type association via HKCR (system-wide, requires admin)
         $progId = "AcroExch.Document.DC"
         $openCmd = "`"$acroExe`" `"%1`""