Workbooks.Open Filename:=cudir & "\" & "05_май" & "\" & "DSDI905_0516.xls"
if Workbooks == nothing{
Workbooks.Open Filename:=cudir & "\" & "06_июнь" & "\" & "DSDI905_0616.xls"
if Workbooks == nothing{
   Workbooks.Open Filename:=cudir & "\" & "07_июль" & "\" & "DSDI905_0716.xls"
}
}