At MyHeritage DNA, go to the DNA Matches page. Select the 3 vertical dots on the right and you’ll get a dropdown. From that select "Export shared DNA segment info for all DNA Matches".
You will be emailed a file with your segment matches named: nnnnnn DNA Matches shared segments dddddd-MH-xxxxxx.zip
where:
nnnnnn is your name
dddddd is the date,
xxxxxx are some hexadecimal numbers, and
.zip indicates this is a compressed file which needs to be unzipped
Note: People in non-English countries or using a non-English version of Windows may have a different filename with words translated.
e.g. Hungarian: nnnnnn DNS-egyezés lista 2019. január 2.-MH-xxxxxx.zip
When Selecting a MyHeritage File in DMT, the dialog box will only display MyHeritage Matches Shared Segment files in English. To find MyHeritage MSS files that have non-English names, either select "All Files(*.*)" in the dropdown of the Select box, or enter *.* into the File Name field.
Save that file.
Then open Windows Explorer in the directory you saved the file, and right-click on it and use the Windows 7-Zip utility to "Extract Here" (or use another unzipping program of your choice).
The file will be expanded and you will get a file with the same name but with a .csv extension on the end.
.csv indicates this is a comma delimited file which can be read by Excel and other programs.
You can rename the file, but ensure that there is a " DN" somewhere in the filename and don't change the ".csv" extension. DMT looks for that to find segment match files and will not accept files with filenames not following that format.
When loaded into Excel, the file can be seen to contain all the chromosome segment matches, as well as a some other information:
Column A (DNA Match ID) contains a string containing the ID of the tester and the ID of his match.
Column B (Name) is the name of the tester.
Column C (Match name) is the name of the person who matches.
Column D (Chromosome), E (Start Location) and F (End Location) is the chromosome number with the start and end locations of the matching segment on that chromosome.
Columns G (Start RSID) and H (End RSID) are the Refererence SNP identification (i.e. the names for) the starting and ending SNPs. DMT does not use these.
Columns I (Centimorgans) and J (SNPs) is the distance in Centimorgans (cM) and number of SNPs for the matching segment.
Note: People in non-English countries or using a non-English version of Windows may have a different header line (Line 1):
e.g. Hungarian: "DNS-egyezési azonosító",Név,"Az egyezés neve",Kromoszóma,Startpozíció,Végpozíció,"RSID kezdet","RSID vége",Centimorgan,SNP-k
Also Note: MyHeritage's DNA Matches List file has a similar name to the DNA Matches Shared Segment file. If you download a Matches List file to the same directory as your segment matches files and pick a Matches List file in DMT by mistake, DMT will show the message ** MH Not Shared Segm to warn you that this is not a Shared Segment file.
