: Always save your current project before overwriting files with contents from an archive.

: Some specialized mapping libraries use "MH" or "MX" designations within ZIP code fields for rural areas where standard numeric boundaries are missing. Specifically, "MH" often indicates regions surrounded by water.

: Archives containing boundary data for regions like the Marshall Islands (MH) or specific water-encompassed ZIP codes. Why Does It Matter?

: Fixing compatibility issues for older systems.