Why does the same CAD drawing behave differently on two computers?

[indiancad]

Both systems may have the same drawing, but the result can still be different.
Fonts, SHX files, plot styles, support paths, and installed add-ons can change how the drawing behaves.
This is why sending only the DWG file is sometimes not enough.
For team projects, I usually keep the required support files together with the drawing.
It makes troubleshooting much easier when another user opens the same file.
What additional files do you always send with a DWG?