The windows agent is lacking some very useful functions (namely nearly the whole vfs-functions). I needed them for a customer project and rewrote them using AutoIt (because that was the quickest and easiest and AutoIt produced the smallest exe-files).
I packed the functions together and wrote a small install script. You can download the whole thing here as a zip-file. Extract it and run the contained install.exe to install the additional functions in your zabbix agent.
The src-dir contains the autoit-sources. Feel free to alter it or the embed additional functions.
Currently available functions: