Types/OpenPackage/get_FileContentType.ps1

<#
.SYNOPSIS
    Gets file content types
.DESCRIPTION
    Gets a table of all files in the package and their associated content types.
#>

$fileContentTypes = [Ordered]@{}
foreach ($part in  @($this.GetParts())) {
    $fileContentTypes[$part.Uri] = $part.ContentType
}
$fileContentTypes