10$ For VBA Code Split Data To Multiple Workbook Based On Unique Values In A Column

[Excel Fox]

IT's working fine for me in the binary format (xlsb).

I've made a small modification. try this

Sub SplitWorkbook()

    Dim colLetter As String, SavePath As String
    Dim lastValue As String
    Dim wb As Workbook
    Dim lng As Long
    Dim currentRow As Long
    colLetter = "P"
    SavePath = "" 'Indicate the path to save
    If SavePath = "" Then SavePath = ThisWorkbook.Path
    'Sort the workbook.
    With ThisWorkbook.Worksheets(1)
        .Sort.SortFields.Add Key:=.Range(colLetter & ":" & colLetter), SortOn:=xlSortOnValues, Order:=xlAscending, DataOption:=xlSortNormal
        With .Sort
            .SetRange .Parent.UsedRange.Cells
            .Header = xlYes
            .MatchCase = False
            .Orientation = xlTopToBottom
            .SortMethod = xlPinYin
            .Apply
        End With
        For lng = 2 To .Range(colLetter & .Rows.Count).End(xlUp).Row
            If .Cells(lng, colLetter).Value = "" Then Exit For
            lastValue = .Cells(lng, colLetter).Value
            .Cells.AutoFilter field:=.Cells(lng, colLetter).Column, Criteria1:=lastValue
            lng = .Cells(.Rows.Count, colLetter).End(xlUp).Row
            Set wb = Application.Workbooks.Add(xlWorksheet)
            .Rows(1 & ":" & lng).Copy wb.Sheets(1).Cells(Rows.Count, 1).End(xlUp)
            wb.SaveAs SavePath & "\" & lastValue, 50
            wb.Close
        Next
        .AutoFilterMode = False
    End With
    
End Sub