This is a compiled MS-Windows resource file containing the bitmap images used for the card-faces in the cognitive function "pairs" and "snap" tests. To view/use it's contents you will need to acquire specialist software which is not downloadable from the UK Biobank website.

This resource is not suitable for displaying within a web-browser.
It can be downloaded or viewed using the link: cardpack.res

If you have wget available (typically on linux systems), then you can also obtain a copy using the command

 wget  -nd  biobank.ctsu.ox.ac.uk/ukb/ukb/docs/cardpack.res