How to detect whether a file has been modified

Name	DataType	Subtype	Length
WSHFSO	Automation	'Windows Script Host Object Model'.FileSystemObject	
WSHFile	Automation	'Windows Script Host Object Model'.File	
OldDate	Date		
NewDate	Date	
OldFileSize	Integer		
NewFileSize	Integer		


....
//here you open the file
....

if isclear(WSHFSO) then
  create(WSHFSO);

if WSHFSO.FileExists(ThePathAndTheFile) then begin
  WSHFile := WSHFSO.GetFile(ThePathAndTheFile);
  OldDate := WSHFile.DateLastModified();
  OldSize := WSHFile.Size;
end;

.....
//here you read the file or what else in you C/AL is
.....

//now you will check if the file is changed during your reading

if WSHFSO.FileExists(ThePathAndTheFile) then begin
  WSHFile := WSHFSO.GetFile(ThePathAndTheFile);
  NewDate := WSHFile.DateLastModified();
  NewSize := WSHFile.Size;
end;

clear(WSHFSO);

if (OldDate <> NewDate) or (OldSize <> NewSize) then
  message('Somebody has change the file');