Set-WindowsImageExecutionPolicy

PS C:\> Get-Help Set-WindowsImageExecutionPolicy -Full
NAME
Set-WindowsImageExecutionPolicy
SYNOPSIS
Sets the PowerShell Execution Policy of a mounted Windows Image
SYNTAX
Set-WindowsImageExecutionPolicy [-ExecutionPolicy] <String> [-Path <String[]>] [<CommonParameters>]
DESCRIPTION
Sets the PowerShell Execution Policy of a mounted Windows Image
PARAMETERS
-ExecutionPolicy <String>
Specifies the new execution policy. The acceptable values for this parameter are:
- Restricted. Does not load configuration files or run scripts. Restricted is the default execution policy.
- AllSigned. Requires that all scripts and configuration files be signed by a trusted publisher, including scripts that you write on the local computer.
- RemoteSigned. Requires that all scripts and configuration files downloaded from the Internet be signed by a trusted publisher.
- Unrestricted. Loads all configuration files and runs all scripts. If you run an unsigned script that was downloaded from the Internet, you are prompted for permission before it runs.
- Bypass. Nothing is blocked and there are no warnings or prompts.
- Undefined. Removes the currently assigned execution policy from the current scope. This parameter will not remove an execution policy that is set in a Group Policy scope.
Required? true
Position? 1
Default value
Accept pipeline input? true (ByPropertyName)
Accept wildcard characters? false
-Path <String[]>
Specifies the full path to the root directory of the offline Windows image that you will service
If a Path is not specified, all mounted Windows Images will be modified
Required? false
Position? named
Default value
Accept pipeline input? true (ByPropertyName)
Accept wildcard characters? false
<CommonParameters>
This cmdlet supports the common parameters: Verbose, Debug,
ErrorAction, ErrorVariable, WarningAction, WarningVariable,
OutBuffer, PipelineVariable, and OutVariable. For more information, see
about_CommonParameters (https:/go.microsoft.com/fwlink/?LinkID=113216).
INPUTS
OUTPUTS
NOTES
21.2.1 Initial Release
RELATED LINKS
https://osd.osdeploy.com/module/functions/dism/set-windowsimageexecutionpolicy

By default, WinPE has the PowerShell Execution Policy to Restricted. This can easily be changed

Example

One thing to keep in mind that if you don't specify the Set-WindowsImageExecutionPolicy Path, it will apply to all mounted Windows Images

Mount-WindowsImageOSD -ImagePath "T:\WinPE\sources\boot.wim"
Set-WindowsImageExecutionPolicy Bypass
Dismount-WindowsImageOSD -Save