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If you open the .out file with a raw data viewer, you can get a glimpse of the contents. The channel names are in text at the top but the data is of course binary. But you can see the patterns in the data and NaN data has characteristic patterns. (sorry I don't have one handy to demonstrate.)

I use the raw file viewer built into FreeCommander, but ViewAnything is another option. The Hex editor plugin for notepad++ might also do it.