opening tar file displays "This does not look like a tar archive"

  archive, cygwin, linux, tar, windows

I have downloaded some data from the internet and the files come with this format

file.pth.tar

when I am trying to open it through cygwin terminal it says:

tar: This does not look like a tar archive
tar: Skipping to next header
tar: Exiting with failure status due to previous errors

I tried to open it in windows but it says
Invalid archive open/read error

I tried to find the file type using: file full_graph.pth.tar

and it displays:

full_graph.pth.tar: data

Source: Windows Questions

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