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(nasm.info)Section 1.3.1

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1.3.1. Installing NASM under MS-DOS or Windows
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   Once you've obtained the DOS archive for NASM, `nasmXXX.zip' (where
`XXX' denotes the version number of NASM contained in the archive),
unpack it into its own directory (for example `c:\nasm').

   The archive will contain four executable files: the NASM executable
files `nasm.exe' and `nasmw.exe', and the NDISASM executable files
`ndisasm.exe' and `ndisasmw.exe'. In each case, the file whose name
ends in `w' is a `Win32' executable, designed to run under `Windows 95'
or  `Windows NT' Intel, and the other one is a 16- bit `DOS' executable.

   The only file NASM needs to run is its own executable, so copy (at
least) one of `nasm.exe' and `nasmw.exe' to a directory on your PATH, or
alternatively edit `autoexec.bat' to add the `nasm' directory to your
`PATH'. (If you're only installing the `Win32' version, you may wish to
rename it to `nasm.exe'.)

   That's it - NASM is installed. You don't need the nasm directory to
be present to run NASM (unless you've added it to your `PATH'), so you
can delete it if you need to save space; however, you may want to keep
the documentation or test programs.

   If you've downloaded the DOS source archive, `nasmXXXs.zip', the
`nasm' directory will also contain the full NASM source code, and a
selection of Makefiles you can (hopefully) use to rebuild your copy of
NASM from scratch.

   Note that the source files `insnsa.c', `insnsd.c', `insnsi.h' and
`insnsn.c' are automatically generated from the master instruction
table `insns.dat' by a Perl script; the file `macros.c' is generated
from `standard.mac' by another Perl script. Although the NASM source
distribution includes these generated files, you will need to rebuild
them (and hence, will need a Perl interpreter) if you change insns.dat,
standard.mac or the documentation. It is possible future source
distributions may not include these files at all.  Ports of Perl for a
variety of platforms, including DOS and Windows, are available from
www.cpan.org.