issues with FileSystemObject and date properties on win server 2016 / IIS 10

Hi

when running this code :

<%
dim ObjFSO
set  ObjFSO = Server.CreateObject("Scripting.FileSystemObject")
response.write ObjFSO.GetFolder("C:\etocomm_appli\sftp\test.txt").DateLastModified
%>

I get a "path not found error".

Replace property by name, size, path, etc. No problem. Problems occur just with date properties (lastaccessed,datecreated), on folders or files.

IUSR has change rights on this path

Any idea or solution ?