Re: file uncompression with native Windows Emacs

[Gene]

On Thursday, December 8, 2016 at 8:29:07 PM UTC-5, Will Parsons wrote:
> I'm confused about what I should expect for file uncompression with
> native Windows Emacs.  I'm running:
> 
> GNU Emacs 25.1.1 (i686-w64-mingw32)
> 
> Curiously, if I visit a file compressed with bzip2, Emacs has no
> problem opening it, but if I visit a file compressed with gzip, Emacs
> complains that "Uncompression program 'gzip' not found".
> 
> How is this supposed to work?  I don't see any compression binaries
> packages in the Emacs installation directory, but I do have an
> ezwinports directory that contains bzip2 utilities, so perhaps Emacs
> is using that (but how does it know?)  If ezwinports is the source of
> bzip2 for Emacs, I don't see similar gzip utilities, so I'm quite
> confused.
> 
> -- 
> Will

Though this may look-like or seem-like something specific, if you use GNU Emacs 
for Windows long enough you'll discover other problems arising from unixoid 
development and operational environment of Emacs.
So if you'd rather fix the problem systemically rather than piecemeal as you 
encounter problems you might want to consider installing Cygwin then using the 
package cygwin-mount to point to the repository of unixoid 
apps/programs/filters which emacs had available to it during it's formative 
years and pretty much retains to date.

Here's a snippet from my package list:
  cygwin-mount       20131111.2146 installed             Teach EMACS about 
cygwin styles and mount points

Another incidental advantage of having cygwin installed is that you can run 
emacs under cygwin if/when you want or need to use emacs in a Unix-like 
environment, for example with BASH running as a shell in a buffer.

If you DO opt to install Cygwin I recommend that you follow Steve Yagi(sp)'s 
advice and NOT install it in c:/cygwin, but rather directly in c:/ so the 
executables will end up in c:/bin/

I've encountered the same problems you have with decompression.
I've often just launched GNU emacs for cygwin from cygwin's terminal then 
effortlessly converted those compressed files, exited cygwin, then accessed the 
decompressed files via GNU emacs for Windows.