Paul writes:

Micky wrote:
I'm not able to print to my newly installed Brother black and white
laser printer so I printed to a file instead. From Firefox.

Use IE, much easier, since it comes up with the OS browse GUI to decide
where to save the file.
In FF, you need to put in the full path to a directory FF has write
permissions to. Simplest would be to open explorer, go to a directory
where your user has write permissions, and then in the URI bar select
the string (this gets around differences in the display names such as
different languages and so on) and paste it into the single-line FF
print to file interface, appending your actual file name after the path.

of explorer
It asks what the name of the file is, and I don't konw what extension
to give it.

Things were the same with my fully functioning Brother AIO, I don't
knolw what to name the file and the 200 page manual doesn't say a word
about that.

When I gave it a .jpg extension, it was described as damaged or
corrupted. I know it wouldn't take a bribe so it must be damaged, or
I named it wrong.

What extension for a print to file?

As David says, try ".prn" as the extension.

Yes, ".prn" is the usual extension for a printjob, use that by all
means.

Regards,
Gernot Hassenpflug
--
NNTP on Emacs 24.3 from Windows 7