I’ve written this code for a user that wanted to change a value in hundreds of Excel files that where in several sub folders under a main folder. This code will go through the main folder C:\Test and will replace the value on cell A1 on Sheet1 of every Excel file it will find. You can adapt this code by changing the folder name, cell destination or sheet name.
Dim fso, folder, files, NewsFile, sFolderSet
objExcel = CreateObject("Excel.Application")
objExcel.Visible = TrueSet
fso = CreateObject("Scripting.FileSystemObject")
sFolder = "C:\Test"
Set folder = fso.GetFolder(sFolder)
Set files = folder.files
For Each SubFolder In folder.SubFolders
For Each folderIdx In SubFolder.files
If Right(folderIdx, 4) = ".xls" Then
Set objWorkbook = objExcel.Workbooks.Open(folderIdx)
Set objWorksheet = objWorkbook.Worksheets(1)
Set objRange = objWorksheet.Range("A1")
objRange.Range("A1").Value = "YOUR VALUE HERE!"