Refactor ImportRegistryFile function to improve offline hive handling and error reporting

Scripts/Helpers/ApplyRegistryRegFile.ps1

@@ -268,53 +268,3 @@ function Invoke-RegistryOperationsFromRegFile {
         Write-Warning "Registry fallback import completed with $accessDeniedCount access-restricted operation(s) skipped in '$RegFilePath'."
     }
 }
-
-function Invoke-RegistryImportViaPowerShell {
-    param(
-        [Parameter(Mandatory)]
-        [string]$RegFilePath,
-        [switch]$UseOfflineHive,
-        [string]$OfflineHiveDatPath,
-        [switch]$HiveAlreadyLoaded
-    )
-
-    $applyScript = {
-        param($targetRegFilePath)
-        Invoke-RegistryOperationsFromRegFile -RegFilePath $targetRegFilePath
-    }
-
-    $hiveAlreadyLoaded = $HiveAlreadyLoaded.IsPresent
-
-    if ($UseOfflineHive) {
-        if ((Get-Command -Name Invoke-WithLoadedBackupHive -ErrorAction SilentlyContinue) -and -not $hiveAlreadyLoaded) {
-            return Invoke-WithLoadedBackupHive -ScriptBlock $applyScript -ArgumentObject $RegFilePath
-        }
-
-        if ([string]::IsNullOrWhiteSpace($OfflineHiveDatPath)) {
-            throw "Offline hive path was not provided for fallback import of '$RegFilePath'"
-        }
-
-        if (-not $hiveAlreadyLoaded) {
-            $global:LASTEXITCODE = 0
-            reg load "HKU\Default" $OfflineHiveDatPath | Out-Null
-            $loadExitCode = $LASTEXITCODE
-            if ($loadExitCode -ne 0) {
-                throw "Failed to load user hive at '$OfflineHiveDatPath' for fallback import (exit code: $loadExitCode)"
-            }
-        }
-
-        try {
-            return & $applyScript $RegFilePath
-        }
-        finally {
-            $global:LASTEXITCODE = 0
-            reg unload "HKU\Default" | Out-Null
-            $unloadExitCode = $LASTEXITCODE
-            if ($unloadExitCode -ne 0) {
-                Write-Warning "Fallback import completed, but unloading HKU\Default failed (exit code: $unloadExitCode)."
-            }
-        }
-    }
-
-    return & $applyScript $RegFilePath
-}