Those numbers of several of thousands Excel "magic" contstants:
From Excel, (alt-F11) Macro Editor, (F2) Object Browser,
Const xlTextQualifierNone = -4142 (&HFFFFEFD2)
Const xlSum = -4157 (&HFFFFEFC3)
Const xlCount = -4112 (&HFFFFEFF0)
Const xlAverage = -4106 (&HFFFFEFF6)
In this example they are passed as options to VB functions, e.g.
XL.Workbooks.OpenText
Sub OpenText(Filename As String, [Origin], [StartRow], [DataType], [TextQualifier
As XlTextQualifier = xlTextQualifierDoubleQuote], [ConsecutiveDelimiter], [Tab],
[Semicolon], [Comma], [Space], [Other], [OtherChar], [FieldInfo], [TextVisualLayout], [DecimalSeparator], [ThousandsSeparator], [TrailingMinusNumbers], [Local])
Best,
-Matt