Not the best demo, since it can't be copied and run without a numbers.dat file, but at least the code below would work if the file exists. Previous demo non-functional.
include std/convert.e
object f = repeat(0, 4)
integer fn = open("numbers.dat", "rb")
f[1] = getc(fn)
f[2] = getc(fn)
f[3] = getc(fn)
f[4] = getc(fn)
atom a = float32_to_atom(f)
GitHub