What is the specific content of the cs file and how can I understand it
They are serialized numpy recarrays (structured arrays).
import numpy as np
cs = np.load("/path/to/file.cs")
print(type(cs))
print(cs.dtype.names)
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.cs files store certain processing results and metadata. They function similarly to star-format files that you may know from other data processing software. In contrast to star-format text files, .cs are binary, which enables some storage savings and faster access.
You can see a list of fields included in a .cs file under Outputs|Data.
.cs files can be manipulated using python commands either as described here or with CryoSPARC Tools.