You could use the readmatrix function as follows:
filename = 'My2.TXK'
opts = detectImportOptions(filename,'FileType','text')
data = readmatrix(filename,opts)
the .TXK extension is not recognised by readmatrix which is why I specified the FileType as text in the import options.
You could optionally read in as a table:
T = readtable(filename,opts)
If you want to get the variable names automatically, for example if you have a number of similar data files, I would need to see what the first line of text looks like generally across the files.