I would recommend also posting this question to the AUTOSOMAL-DNA mailing list: http://lists.rootsweb.ancestry.com/index/other/DNA/AUTOSOMAL-DNA.html The subscribers there have a great deal of experience working with data from both companies (and 23andMe). Diana > From: Bill Hawk > Sent: Friday, January 10, 2014 2:45 PM > To: [email protected] > Subject: [yDNAhgI] transfer of Ancestry.com autosomal data to FTDNA > > I arranged to do subject transfer. Downloaded file from Ancestry, and > purchased the Family-Finder test. When I look at the unzipped data, it appears > that there are formatting errors. The file is tab delimited, and when the rs > number has less than 6 digits, the first tab is missing, which offsets the > columns. I questioned Ancestry about this and the service person said this had > been reported before and causes no problems with data transfer to other > companies. Has anybody on the list had experience with this problem? Does > FTDNA recognize and deal with this situation?