I have created a macro that imports a file and makes necessary changes. The
file location and name are embedded in the macro and must be change prior to
running the macro.

How can I present a dialog box that allows the user to select the file to be
imported?

My current macro is below:

Sub FixWorksheet()
'
' FixWorksheet Macro
' Macro recorded 8/10/2007 by Robert Harris
'
   With ActiveSheet.QueryTables.Add(Connection:= _
       "TEXT;\\server\folder\filename.txt" _
       , Destination:=Range("A1"))
       .Name = "filename"
       .FieldNames = True
       .RowNumbers = False
       .FillAdjacentFormulas = False
       .PreserveFormatting = True
       .RefreshOnFileOpen = False
       .RefreshStyle = xlInsertDeleteCells
       .SavePassword = False
       .SaveData = True
       .AdjustColumnWidth = True
       .RefreshPeriod = 0
       .TextFilePromptOnRefresh = False
       .TextFilePlatform = xlWindows
       .TextFileStartRow = 1
       .TextFileParseType = xlDelimited
       .TextFileTextQualifier = xlTextQualifierDoubleQuote
       .TextFileConsecutiveDelimiter = False
       .TextFileTabDelimiter = True
       .TextFileSemicolonDelimiter = False
       .TextFileCommaDelimiter = False
       .TextFileSpaceDelimiter = False
       .TextFileColumnDataTypes = Array(2, 2, 2, 2, 2, 2, 2, 2, 3, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 1, 2, _
       1, 3, 1, 1, 3, 3)
       .Refresh BackgroundQuery:=False
   End With
   Rows("1:4").Select
   Selection.Delete Shift:=xlUp
   Range("AB2").Select
   ActiveCell.FormulaR1C1 = _
       
"=IF(AND(OR(RC[-16]=""OTHER"",RC[-16]=""SELF""),LEFT(RC[-26],LEN(RC[-17]))=RC[-17]),IF(RC[-27]=0,"""",RC[-27]),"""")"
   Range("AC2").Select
   ActiveCell.FormulaR1C1 =
"=IF(AND(OR(RC[-17]=""OTHER"",RC[-17]=""SELF""),LEFT(RC[-27],LEN(RC[-18]))=RC[-18]),RC[-20],"""")"
   Range("AB2:AC2").Select
   Selection.AutoFill Destination:=Range("AB2:AC10000"), Type:=xlFillDefault
   Columns("AC:AC").Select
   Selection.NumberFormat = "m/d/yyyy"
   
'
End Sub

Thanks for your help. (I am just starting to explore programming so be as
specific as possible)