internal/functions/Get-DbaDbPhysicalFile.ps1

function Get-DbaDbPhysicalFile {
    <#
    .SYNOPSIS
    Gets raw information about physical files linked to databases
 
    .DESCRIPTION
    Fastest way to fetch just the paths of the physical files for every database on the instance, also for offline databases.
    Incidentally, it also fetches the paths for MMO and FS filegroups.
    This is partly already in Get-DbaDbFile, but this internal needs to stay lean and fast, as it's heavily used in top-level functions
 
    .PARAMETER SqlInstance
    SMO object representing the SQL Server to connect to.
 
    .EXAMPLE
    Get-DbaDbPhysicalFile -SqlInstance server1\instance2
 
    .NOTES
        Author: Simone Bizzotto
 
        dbatools PowerShell module (https://dbatools.io, clemaire@gmail.com)
       Copyright: (c) 2018 by dbatools, licensed under MIT
        License: MIT https://opensource.org/licenses/MIT
       #>

    [CmdletBinding()]
    param(
        [parameter(Mandatory)]
        [Alias("ServerInstance", "SqlServer")]
        [DbaInstanceParameter]$SqlInstance,
        [Alias("Credential")]
        [PSCredential]
        $SqlCredential
    )
    try {
        $Server = Connect-SqlInstance -SqlInstance $SqlInstance -SqlCredential $SqlCredential
    } catch {
        Stop-Function -Message "Error occured while establishing connection to $instance" -Category ConnectionError -ErrorRecord $_ -Target $SqlInstance
        return
    }
    if ($Server.versionMajor -le 8) {
        $sql = "SELECT DB_NAME(dbid) AS Name, filename AS PhysicalName FROM sysaltfiles"
    } else {
        $sql = "SELECT DB_NAME(database_id) AS Name, physical_name AS PhysicalName FROM sys.master_files"
    }
    Write-Message -Level Debug -Message "$sql"
    try {
        $Server.Query($sql)
    } catch {
        throw "Error enumerating files"
    }
}