View source for Compress/Decompress scripts

The "GZIP" program is here a built-in function. I guess that other file types (than SQL scripts) can be compressed in a .gzip-archive but what do I know?

Scripts are usually used to upgrade forest databases, more described here [http://heureka.resgeom.slu.se/wiki/index.php?title=Category:Database_scripts], but can also be executed in a result database, in SQL Server Management Studio, to derive results (if you don't succeed in viewing results in "Tables, Diagrams, and Reports"). But maybe this refer to other scripts, or maybe a temporary functionality used by the programmers?