Rich Text Editor in Powershell GUI (WinForms)

I recently needed a way to send merged mail through Powershell. That part is easy enough, but to take it a bit further, i wanted to be able to edit the mail in “HTML” format before sending it, without having to write HTML code.

I googled my a** off trying to find a way to do this without having to buy a product to add this. I found plenty for C#, but none ready for Powershell.

What i ended up doing was downloading the one created by Carl Nolan for C# ( and compiling it using Visual Studio Code. Then i simply took the DLL and loaded in Powershell (DL link for just the dll HERE)

How to load the dll:

Add-Type -Path "C:\Windows\System32\MSDN.HtmlEditorControl.dll"

Then to add the box to display a predefined text in $EmailBody:

$BodyRichBox = New-Object System.Windows.Forms.RichTextBox
$System_Drawing_Size = New-Object System.Drawing.Size
$System_Drawing_Size.Height = 315
$System_Drawing_Size.Width = 550
$rteditor.MinimumSize = $System_Drawing_Size
$System_Drawing_Point = New-Object System.Drawing.Point
$System_Drawing_Point.X = 635
$System_Drawing_Point.Y = 135
$rteditor.Location = $System_Drawing_Point
$rteditor.Name = "htmlEditorControl"
$rteditor.TabIndex = "4"
$rteditor.InnerHtml = $EmailBody
$rteditor.Font = "Arial"
$rteditor.Anchor = "Top,Left,right,Bottom"
$System_Windows_Forms_Padding = New-Object System.Windows.Forms.Padding
$System_Windows_Forms_Padding.Right = 10
$rteditor.Padding = $System_Windows_Forms_Padding

End result for me was this:


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