Have you been opening/editing this file with Excel?
It contains a weird mix of commas (,) and dots (.) to separate the decimal and fractional parts of the values... Matlab cannot read values with commas easily. And no one does, these files should be reconverted.
If this is a file directly generated by the Muse software, this should be reported as a bug.
If someone after acquisition opened this file with Excel or any other program: tell that person to change the settings of the program to use only dots and no commas.
I will fix the Muse reader in Brainstorm to work with a mix of . and , but think about revising your acquisition procedure and/or report this as a bug to Muse customer support.