Acrobat Reader is required to read PDF files. As ESRI Shapefiles for advanced desktop GIS processing. ArcView GIS can read, analyze and edit them without conversion. As Microsoft Excel spreadsheets with an .xls file extension. As ZIP files , which need to be unzip ped into their original formats before they become accessible by software such as word processors, GIS software, databases or spreadsheets.
Zip files are files that have been compressed for faster download.
To use this file with a GIS system such as ArcView, the file must first be unzipped. There are a number of unzipping utilities available. The most popular of them is WinZip. A free trial version of WinZip can be downloaded from here .