extra_features and extra_capabilities are broken with Windows Server 2025 as host OS

[branzo]

Hello,

I came into some issues when defining multiple features (or capabilities) to be installed at the same time, as an example:

Set-IniFileValue -Path $configFilePath -Section "Default" -Key "extra_features" -Value "Microsoft-Hyper-V,Microsoft-Hyper-V-Management-Clients"

and/or:

Set-IniFileValue -Path $configFilePath -Section "Default" -Key "extra_capabilities" -Value "OpenSSH.Server,OpenSSH.Client"

It seems that the values are correctly split (by the split(",") by

if ($windowsImageConfig.extra_features) {
                Enable-FeaturesInImage $winImagePath $windowsImageConfig.extra_features.split(",")
            }

if ($windowsImageConfig.extra_packages) {
                foreach ($package in $windowsImageConfig.extra_packages.split(",")) {
                    Add-PackageToImage $winImagePath $package -ignoreErrors $windowsImageConfig.extra_packages_ignore_errors
                }
            }

but then, "Enable-FeaturesInImage" (or Add-PackageToImage) passes a string "Microsoft-Hyper-V Microsoft-Hyper-V-Management-Clients" instead of "Microsoft-Hyper-V" and "Microsoft-Hyper-V-Management-Clients" to dism.exe.

Contrary to what's been reported in this PR, if the value is unquoted, Set-IniFileValue complains about not being able to convert the value into System.String.

Host OS: Windows Server 2025
Powershell version: 5.1.26100.7462

Regards,
B.

[ader1990]

Hello, I could not reproduce the issue you have.

Do you have an exact config.ini file that I can test out and can you please provide if possible - the error logs that you are actually seeing?

Thanks.

[branzo]

Sure, here's the config: config_2k25.ini.txt (with quoted value passed to Set-IniFileValue).

As for the log, here's what happens:

[...]
05/06/2026 09:24:38 - Virtual IO Drivers was added.
05/06/2026 09:24:39 - ISO Virtual Drivers have been adeed.
WARNING: Dism failed to enable features: Microsoft-Hyper-V Microsoft-Hyper-V-Management-Clients Microsoft-Hyper-V-Management-Powershell
WARNING: Dism failed to enable features: Microsoft-Hyper-V Microsoft-Hyper-V-Management-Clients Microsoft-Hyper-V-Management-Powershell
WARNING: Dism failed to enable features: Microsoft-Hyper-V Microsoft-Hyper-V-Management-Clients Microsoft-Hyper-V-Management-Powershell
05/06/2026 09:36:30 - Dism failed to enable features: Microsoft-Hyper-V Microsoft-Hyper-V-Management-Clients Microsoft-Hyper-V-Management-Powershell
Dism failed to enable features: Microsoft-Hyper-V Microsoft-Hyper-V-Management-Clients Microsoft-Hyper-V-Management-Powershell
At V:\windows-imaging-tools\WinImageBuilder.psm1:690 char:34
+ ... STEXITCODE) { throw "Dism failed to enable features: $featureNames" }
+                   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : OperationStopped: (Dism failed to ...ment-Powershell:String) [], RuntimeException
    + FullyQualifiedErrorId : Dism failed to enable features: Microsoft-Hyper-V Microsoft-Hyper-V-Management-Clients Microsoft-Hyper-V-
   Management-Powershell