I don't know if any of my wonton speculation was right, but I can reproduce the 
problem on my system, and applying  ucp  to the literal passed to  shell_jtask_ 
 fixes it:

           'iceland' fwrite fn =. jpath '~temp\','.txt',~195 166 { a.
        7

           fread fn
        iceland

           require'task'
           
           shell    'copy "',fn,'" "',fn2=.jpath'~temp\ae.txt'
        The system cannot find the file specified.
        
           fread fn2   NB.  Failure
        _1
           
           shell ucp 'copy "',fn,'" "',fn2
                1 file(s) copied.
        
           fread fn2   NB.  Success.
        iceland
           

Hope this helps,

-Dan
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