How can I convert a shapefile boundaries to lat and lon?

I have a shapefile of counties subdivisions (Paraná State, Brazil) and I would like to extract an array of bounding lat and lon for each division. Is it possible to do?

In this example, the bounding are X and Y (the LAT and LON columns refers to the location of the county seat).

File example attached.

[darova]

What is the connection between lat/lon ad X/Y?

[David Franco]

X/Y are some projection in a differente unit system...

Answer 1

[Chad Greene]

If it's a standard map projection, use projinv.