ImportDTI[folder]
imports xx.dat,yy.dat,zz.dat,xy.dat,xz.dat and yz.dat from the given folder.
ImportDTI[folder,add]
imports xx-add.dat, yy-add.dat, zz-add.dat, xy-add.dat, xz-add.dat and yz-add.dat from the given folder.
ImportDTI[{file1,file2,..}]
imports the given *.dat files.
https://wolfram.com/xid/0mevpbncy4li7pyz0hsyb0-db0miu