The only difference from the latest original one is in trik_studio_utils{.c,.h} files. These files should be moved somewhere else outside of the folder, and pure generic/genuine nxtOSEK can be used after that.
This is a GNU GCC arm-none-eabi Win32(!) toolchain from ARM https://developer.arm.com/tools-and-software/open-source-software/developer-tools/gnu-toolchain/gnu-rm/downloads But stripped a little bit. Nevertheless, the original one can be used. Just unpack the downloaded archive and move everything into ./gnueabi to have /bin and /arm-none-eabi folders in the ./gnueabi
This from mingw64/MSys2
From http://gnuwin32.sourceforge.net/packages.html
From https://sourceforge.net/projects/win-bash/files/latest/download