IniParser

<#
.SYNOPSIS
Get-IniItem displays found key-value pairs in ini file.

.Description
Get-IniItem displays found key-value pairs in ini file based on passed wildcard expression.
Only *, ?, [] wildcards are supported.

.PARAMETER Name
Specifies ini file path.

.PARAMETER Filter
Specifies key-value pair file filter. Use section.key syntax to filter key-value pairs. If key-value pair has no section you can omit section name.

.INPUTS
No inputs accepted.

.OUTPUTS
System.Collections.Generic.Dictionary<string, string>
#>

using namespace System.Collections.Generic;

[CmdletBinding()]
param (
    [switch]
    $Version,
    [Parameter(Mandatory)]
    [string]
    $Name,
    [Parameter(Mandatory)]
    [string]
    $Filter
)

class Section {
    [string] $Name;
    [IDictionary[string, string]] $KeyValuePairs

    Section([string] $name) {
        $this.Name = $name
        $this.KeyValuePairs = New-Object -TypeName "Dictionary[string, string]"
    }

    [void] Add([string] $key, [string] $value) {
        if (!$key) {
            throw "Key must be non-empty string."
        }

        $this.KeyValuePairs.Add($key, $value)
    }

    [void] Remove([string] $key) {
        if (!$key) {
            throw "Key must be non-empty string."
        }

        $this.KeyValuePairs.Remove($key)
    }
}

function Get-IniFileContents($name) {
    if (-not (Test-Path $name)) {
        throw "File doesn't exist."
    }

    $globalSection = New-Object -TypeName "Section" -ArgumentList ""
    $currentSection = $globalSection
    $sections = @($globalSection)

    foreach ($line in Get-Content $name) {
        switch -Regex ($line) {
            "^\s*(#.*)?$" {
                continue
            }
            "^\s*\[(.+?)\]\s*$" {
                $currentSection = New-Object -TypeName "Section" -ArgumentList $Matches[1]
                $sections += $currentSection
            }
            "^\s*(\w+)=(\w+)\s*$" {
                $currentSection.Add($Matches[1], $Matches[2])
            }
            default {
                throw "Wrong ini file format: `"$line`" must be an empty line, comment, section or key-value-pair declaration."
            }
        }
    }

    Write-Output $sections
}

Set-Variable -Name SuccessStatus -Value 0 -Option Constant
Set-Variable -Name WrongOptionStatus -Value 2 -Option Constant

if ($Filter -notmatch "\.") {
    $Filter = ".$Filter"
}

$filterArray = $Filter -split "\."
$sectionName = $filterArray[0]
$keyName = $filterArray[1]

Get-IniFileContents $Name |
    Where-Object { $_.Name -like $sectionName } |
        Select-Object -ExpandProperty KeyValuePairs

exit $SuccessStatus