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examples/PowerShell/Select-FileDialog.ps1

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+# Note: store in your profile for easy use
+# Example use:
+# $file = Select-FileDialog -Title "Select a file" -Directory "D:\scripts" -Filter "Powershell Scripts|(*.ps1)"
+
+function Select-FileDialog
+{
+	param([string]$Title,[string]$Directory,[string]$Filter="All Files (*.*)|*.*")
+	[System.Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms") | Out-Null
+	$objForm = New-Object System.Windows.Forms.OpenFileDialog
+	$objForm.InitialDirectory = $Directory
+	$objForm.Filter = $Filter
+	$objForm.Title = $Title
+	$Show = $objForm.ShowDialog()
+	If ($Show -eq "OK")
+	{
+		Return $objForm.FileName
+	}
+	Else
+	{
+		Write-Error "Operation cancelled by user."
+	}
+}
+
+$file = Select-FileDialog -Title "Select a file" -Directory "D:\scripts" -Filter "Powershell Scripts (*.ps1)|*.ps1"
+
+#multiple file category arguments should not include extra space:
+#-Filter “Text files (*.txt) | *.txt | All files (*.*) | *.*”
+#does not work — only show *.* filter.
+#-Filter “Text files (*.txt)|*.txt|All files (*.*)|*.*”
+#works.