Okay, binary data. :( Do you know what the file is supposed to contain? What is created on a Intel x86 machine (that is, is the floating point format likely to be compatible with your current machine)? Unless you know something about the data you are reading in, you're flying blind.
I might be tempted to try:
f = fopen('foo.dat, 'rb');
D = fread(f, inf, '*float');
fclose(f);
plot(D);
Does a signal eventually emerge in the plot? If there is a header following by a stream of vector data, you might see a burst of noise (the header) followed by the data.
Beyond this, I don't have a lot of ideas, sorry.
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