.dat file is not read correctly

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Do you have any information about the origin of this data file? Like what system it was recorded from? The .dat file you shared appears to have a single time series (first column time?, second column value) and no information about sensor name, position, units, etc. A file like this can be read into Python like so:

import numpy as np
import matplotlib.pyplot as plt

data = numpy.loadtxt("1_class_1.dat")
data = data.T
plt.plot(*data)
plt.show()

Figure_1

…and in theory you could then create an MNE object from it using RawArray:

import mne
times = data[0]
values = data[1]
sfreq = 1 / np.diff(times).mean()  # 250.0000000000236, maybe round this to 250?
info = mne.create_info(['mystery channel'], sfreq=sfreq)
raw = mne.io.RawArray(data=np.atleast_2d(values), info=info)

…but again, without knowing at least the units of measurement it’s hard to know what you might do with that.

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