I need a macro, for Microsoft Visual Studio 2005 Express Edition, that
will replace all instance of the tab character in a file and replace
it with 4 spaces.

You do not need to writ this macro, just point me to a download location.

Hi Kristoph,

This is the macro I came up for search & replace. Do you require the
macro to perform the search & replace on a specific document, the
active document or all documents?  The macro below is for a specific
document named "Default.aspx".  Change the 3rd line of the procedure
if you need to specify a different document.

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Option Strict Off
Option Explicit Off
Imports System
Imports EnvDTE
Imports EnvDTE80
Imports System.Diagnostics

Public Module RecordingModule

    Sub TabToSpacesMacro()
        DTE.ExecuteCommand("Edit.Replace")
        DTE.Find.Action = vsFindAction.vsFindActionReplaceAll
        DTE.Windows.Item("Default.aspx").Activate()  'Document to search
        DTE.Find.FindWhat = "\t"
        DTE.Find.ReplaceWith = "    "
        DTE.Find.Target = vsFindTarget.vsFindTargetCurrentDocument
        DTE.Find.MatchCase = False
        DTE.Find.MatchWholeWord = False
        DTE.Find.MatchInHiddenText = True
        DTE.Find.PatternSyntax = vsFindPatternSyntax.vsFindPatternSyntaxRegExpr
        DTE.Find.ResultsLocation = vsFindResultsLocation.vsFindResultsNone
        DTE.Find.Action = vsFindAction.vsFindActionReplaceAll
        If (DTE.Find.Execute() = vsFindResult.vsFindResultNotFound) Then
            Throw New System.Exception("vsFindResultNotFound")
        End If
        DTE.Windows.Item("{CF2DDC32-8CAD-11D2-9302-005345000000}").Close()
    End Sub
End Module

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David Luu

replace(chr(9),"    ") 

will do the trick, nothing fancy. As for accessing the file, it
depends on where it is and if you want to give the user a "Browse"
dialog, but the replace statement is the crux of it.