Does it exist a way to create a COM port based on a VXI serial port instrument

The goal is to be able to access a serial port located in a VXI instrument either through VISA ASRL device or through Windows API (createfile, writefile, readfile)functions

It's just not feasible. Windows requires a kernel driver for Serial ports, and you couldn't implement your VXI accesses in the kernel because we don't provide kernel-level APIs to you. NI-VXI and NI-VISA are user-level APIs only.
If you absolutely must do this, note that I said it is not feasible - but it is possible. You'd have to have your kernel driver call out to another user-level process that in turn made VISA calls. This has been done before, both at NI and elsewhere, and I highly discourage it because it's extremely error-prone and you're too likely to get blue screens. A kernel driver just is not meant to make calls back out to the user level.
Dan Mondrik

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