Here is some code to give you a couple ideas on how to check a directory.
code:
if exist("h:\")
   ? "The directroy\file exists"
else
   ? "The directory\file does NOT exist"
endif

$attributes = GetFileAttr("h:\")
if $attributes = 0
   ? "An Error occurred: (" + @error + ") " + @serror
else
   if $attributes  & 16
      ? "The directory exists"
   else
      ? "This is not a directory"
   endif
endif
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