Aqui está uma amostra típica:
Sub Sample_Cvs_To_Xlsx()
ChDir "C:\TestFolder"
Workbooks.Open Filename:="C:\TestFolder\WhatEver.csv"
'
' perform processing
'
ActiveWorkbook.SaveAs Filename:="C:\TestFolder\WhatEver.xlsx", FileFormat:= _
xlOpenXMLWorkbook, CreateBackup:=False
ActiveWorkbook.Close
End Sub