> For the complete documentation index, see [llms.txt](https://docs.os.uk/os-downloads/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.os.uk/os-downloads/products/transport-network-portfolio/os-mastermap-highways-network-fundamentals/os-mastermap-highways-network-getting-started-guide/unzipping-gml-geopackage-and-vector-tiles-files.md).
# Unzipping GML, GeoPackage, and vector tiles files
## How do I unzip the GML files?
The Highways GML data is supplied in a compressed form (gzip). Some software can access these files directly; others will require it to be uncompressed. To uncompress the zipped data files (.gz extension), use an unzipping utility found on most PCs, for example, WinZip. Open-source zipping / unzipping software can be downloaded from the Internet, for example, 7-Zip.
## How do I unzip the GeoPackage and vector tiles files?
Before loading the data, you will need to unzip it by using any of the regular zip programs available or via the facility within the Windows 10 operating system.
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