I bricked my p3s with ftp range mod - let's fix it together

I'm reverse-engineering a serial protocol and getting frustrated by bad tools. Does anyone know of a good, free tool for logging data to/from serial ports on Windows?

Requirements:
Must not take control of the port (i.e. must hook the file APIs or the kernel rather than trying to open the device)
Must have some sort of filtering features
Writes either human-readable or binary logs, preferably in an easy to parse format
Any ideas? Who has tried a commercial tool from this "Best serial port monitor"?
 

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