Using Programming Languages other than VBA

Sub Example_SavePreviewThumbnail()
	' This example returns the current setting of
	' SavePreviewThumbnail. It then changes the value, and finally
	' it resets the value back to the original setting.

	Dim preferences As AcadPreferences
	Dim currSavePreviewThumbnail As Boolean

	Set preferences = ThisDrawing.Application.preferences

	' Retrieve the current SavePreviewThumbnail value
	currSavePreviewThumbnail = preferences.OpenSave.SavePreviewThumbnail
	MsgBox "The current value for SavePreviewThumbnail is " & preferences.OpenSave.SavePreviewThumbnail, vbInformation, "SavePreviewThumbnail Example"

	' Change the value for SavePreviewThumbnail
	preferences.OpenSave.SavePreviewThumbnail = Not (currSavePreviewThumbnail)
	MsgBox "The new value for SavePreviewThumbnail is " & preferences.OpenSave.SavePreviewThumbnail, vbInformation, "SavePreviewThumbnail Example"

	' Reset SavePreviewThumbnail to its original value
	preferences.OpenSave.SavePreviewThumbnail = currSavePreviewThumbnail
	MsgBox "The SavePreviewThumbnail value is reset to " & currSavePreviewThumbnail, vbInformation, "SavePreviewThumbnail Example"
End Sub