These are split files for easy download for those on dialup.

You will need some tool for joining the files after download. Windows has
various tools, including one called 'SFK'.

In Windows, it is also possible to open a commandline window and execute
commands to join the files.

The script 'join-xxxx.sh' (where 'xxx' is the name describing the total file),
is a Linux batch file that will perform the join.
Running any variety of Linux, download the parts, then open a terminal
window (commandline window) where they are downloaded to, then run the
script. For example:

# ./join-puppy-2.17.1.sh

where the '#' is the prompt (not typed) and the './' is essential.