Calculate extent

[Nuri]

I'm trying to use my own shapes and nothing occurs when I use mapserver in
the browser.

I think that EXTENT coordinates aren't correct. I used shpinfo.exe to find
them. When I create EXTENT of an existing shape that runs perfecly with
the example EXTENT I don't have the same result and it doesn't run.

Does someone knows another programme to calculate EXTENT?

Thank you.

Nuri