saving file with ∆ character in it's name to disk

[enztec]

Hi,

i can create a file with name ∆r with vim fine
and can )copy ∆r  fine into the apl ws

but when i use following to create the file on disk from inside apl with
 h ← 'w' ⎕fio[3] '∆r'
 rs←'∆r' ⎕fio[23] h
 rs←⎕fio[4] h

the file name created on disk is ^Fr  and not ∆r         the real one character 
^F doesn't show  in my browser but is   created from ^v^f
to rm the file i can do  rm -i ^v^fr

so    rm ^Fr       ^Fr name created with ^v^fr
/bin/rm: remove regular file `\006r'?

i have been moving the file name back and forth from ^Fr <-> ∆r (with )host) so 
the correct name is used for either file created on disk or )copy from disk

any suggestions?   my messing(s) with ⎕ucs didn't work in either direction

thanks

enztec