>

>>>copy file m.txt to ('c:\Vaniermu\' + justfname(m.fln))
>

>into
>

>>>copy file m.txt to ('c:\Vaniermu\' + m.fln)
>

>ie, take out justfname() which throws away the extension you just added

Justfname() strips the path only; justStem() strips the extension too. I think you mixed them up.