GGSCI (slc06vyg) 2> add exttrail .\dirdat\ed, ext edb3001, megabytes 1
ERROR: file portion must be two characters.
Answer: If the file name has only two character, then check the "\" and "/". This might be difference on LINUX and Windows. For one case, when using "/" in LINUX, the error is shown. After correcting it to use "/" the error is gone.