To necro a post is to raise it from the dead. This thread is from 2015, it is very old. Posting again to an old thread raises it back up to the forefront, I for instance know this because I get automatic emails from posts I have contributed to, so as you can imagine, if people starting posting in all old posts, my email would collapse. You can show your apreciation to posts by clicking the Like button below the post.
Also note that old posts my not use current thinking/technology. For instance if you are using an XLSX file, and have SAS 9.4 then you can far simpler access data by using the libname excel engine:
http://blogs.sas.com/content/sasdummy/2015/05/20/using-libname-xlsx-to-read-and-write-excel-files/
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