Various help/tools for the Mozilla development community. HTH.
XPT files are cross-platform, meaning that you can generate it on one platform and use it on all others.
More info on how to use the compiler is in the README in the package and in the book
Creating Applications with Mozilla.
The Linux tarball includes the required (GNOME) libraries, in case you don't have them on your system.
The Windows exe needs the "Netscape wintools", see the relevant section at the Win32 build page.