theWord has been developed for the Windows operating system, and is compatible with Windows 98 upwards (including Windows XP, Vista, Windows 7, Windows 8, 32bit and 64 bit editions).

Some of the unicode features are not available in older Win9x systems. There is special support for localized Win9x systems though (e.g. Arabic Windows 98 will properly display contextual shaped Arabic text). In Windows 2K upwards, there is full support for all languages.

It has also been reported to run well on Linux and Mac with the use of emulators. Please, see the relevant forum entries for how to install theWord on non-Windows operating systems.