This script will convert (most of) the output of a parsed GPO from Microsofts LGPO utility.
Download LGPO from the Microsoft Security Compliance Toolkit [https://www.microsoft.com/en-us/download/details.aspx?id=55319]
Open a cmd prompt or powershell and go to the directory of the extraacted LGPO utility. Use the /m switch for machine or /u for user policy
> LGPO.exe /parse /m [path/to/gpo/registry.pol] >> lgpo.txt
Required
-OutputFile : Destination file path for the audit file
-GPOSettingsFile : Parsed GPO file from LGPO
Optional
-AuditVersion : Set the audit file version
-ADMLTempDB : Set the temp
-AuditDescription : Set the audit file description
-PolicyDefsFolder : Folder path that contains the ADML files
-ShowVerbose : Show verbose messages
Examples
.\gpo_to_audit.ps1 -OutputFile 'C:\Temp\nessus_win_baseline.audit' -GPOSettingsFile 'C:\Temp\computers_gpo.txt'
.\gpo_to_audit.ps1 -AuditVersion 2 -ShowVerbose