Under the new beginner, can you tell me the vba read the file problem (enclosed some specific code)-CodePudding

May I ask you bosses under
The code can be simplified into
Sub test ()
The Set RRR=CreateObject (" Scripting. FileSystemObject ")
The Set r=RRR. GetFolder (" D: \ practice ")
For Each I In r.F iles
Workbooks. Open Filename:=(" D: \ \ practice "+ i.N ame +" ")
ActiveSheet. Range (" A1 ")=1
ActiveWorkbook. Close SaveChanges:=True
Next
End Sub

Code is designed to make D/practice this folder each workbook A1 area of assignment 1

The Workbooks, please. Open Filename:=(" D: \ \ practice "+ i.N ame +" ") in this line of code, two plus refers to what do you mean? Why must have these two +? Tried without the plus sign will be an error, is this why?