function isValidFileName(Afile:String):boolean;
var
i:integer;
begin
Result:=false;
if Afile<>'' then
begin
Result:=true;
for i:=1 to length(Afile) do
if (Afile[i] in ['/','\','<','>','|',':','?','*','"']) then
begin
Result:=false;
break;
end;
end;
end;