Powershell: File Dialog

Here is an example of presenting the user with a file dialog. 
This script also does some conversion and opens the CSV in Excel when it's done.

############################################################################################
#
# SSID Report Conversion
# Process SSID report from NCS.  Calculate connection time in seconds and KB transferred
#

Function Get-FileName($initialDirectory)
{   
 [System.Reflection.Assembly]::LoadWithPartialName("System.windows.forms") | Out-Null
 $OpenFileDialog = New-Object System.Windows.Forms.OpenFileDialog
 $OpenFileDialog.ShowHelp = $true
 $OpenFileDialog.initialDirectory = $initialDirectory
 $OpenFileDialog.filter = "All files (*.*)| *.*"
 $OpenFileDialog.ShowDialog() | Out-Null
 $OpenFileDialog.filename
} #end function Get-FileName

# 

[string]$infile = Get-FileName -initialDirectory "Downloads"
if (-not $infile) { exit }

$outfile = $infile -replace ".csv", "-ADJUSTED.csv"

$file = get-content $infile
$today = Get-Date
$today = $today.touniversaltime()

write-output "Converted:  $today" | out-file -encoding ASCII -filepath $outfile
foreach ($line in $file) {
 $field = $line.split(",")
 if ($field.count -eq 13) {# report body
  if ($field[0] -eq "Client Username") { #header line (first field heading matches)
   $heading = $line + ",Seconds Connected,KBytes Transferred"
   write-output $heading | out-file -encoding ASCII -filepath $outfile -append
   continue
  } #end header line

  #fix average Kb
  $avgKbits = $field[6]
  if ($avgKbits -eq "<0.1") { $avgKbits = 0 }
 
  #Connection time in seconds
  $conn = $field[5]
  [array]$seperator = " hrs " , " min " , " sec"
  $option = [System.StringSplitOptions]::RemoveEmptyEntries
  $hours = 0
  $minutes = 0
  $seconds = 0
  $connection = 0
  $temp = $conn.split($seperator, $option)
  if ($temp.count -eq 3) {
   $hours = [int]$temp[0]
   $minutes = [int]$temp[1]
   $seconds = [int]$temp[2]
   }
  elseif ($temp.count -eq 2) {
   $minutes = [int]$temp[0]
   $seconds = [int]$temp[1]
   }
  elseif ($temp.count -eq 1) {
   $seconds = [int]$temp[0]
   }
  $connection = ( $hours * 60 * 60 )  + ( $minutes * 60 ) + $seconds

  #Bytes transferred
  $KBytes = $connection * $avgKbits * 8
  $line = $line + "," + $connection + "," + $KBytes
  write-output $line | out-file -encoding ASCII -filepath $outfile -append
 }#end if 16 fields

 else {# report heading line (does not have 13 fields)
  write-output $line | out-file -encoding ASCII -filepath $outfile -append
 }#end else 

}#end foreach line

start excel $outfile