Extremely sorry for posting under the wrong thread. I was thinking to have all discussion under a thread for easy reference. However, I did post the same question under WCA. The output format (omwc) of Wind Climate Analyst did not work. So I tried to change to OWC format as you said and it worked. Thank you very much. Some files are reported as "NOT IMPORTABLE!". However, using independent statistical software (STATA), I could not find consistency issues. I will copy the other error message and post it soon. Thank you once again.