In my version of git-for-windows, bash defines that environment variable as 
ProgramW6432.  

On Tuesday, September 17, 2019 at 6:10:01 PM UTC-4, CrispyDrone wrote:
>
> *Describe the bug*
> I've exhausted all options and followed the documentation but am unable to 
> get :! {cmd} to work with the following shell configuration:
>
> set shell=\"$PROGRAMW6432\Git\bin\bash.exe\"
>
> I've also the tried the following and more:
>
> set shell=$PROGRAMW6432\Git\bin\bash.exe
> set shell=$PROGRAMW6432/Git/bin/bash.exe
> set shell=\"\"$PROGRAMW6432/Git/bin/bash.exe\"\"
> set shell=\'\"$PROGRAMW6432/Git/bin/bash.exe\"\'
> set shell=\"\'$PROGRAMW6432/Git/bin/bash.exe\'\"
> set shell=\'$PROGRAMW6432/Git/bin/bash.exe\'
> set shell=\"C:\Program Files\Git\bin\bash.exe\"
> set shell=\"C:\Program\ Files\Git\bin\bash.exe\"
> set shell=\"C:\Program\\ Files\Git\bin\bash.exe\"
> set shell=\"C:\Program\\\ Files\Git\bin\bash.exe\"
> set shell=C:\Program\\\ Files\Git\bin\bash.exe
> ...
>
> *To Reproduce*
>
>    1. Run vim -u .vimrc where .vimrc contains the single set shell line 
>    of configuration. 
>    2. Execute for example :!ls 
>    3. Receive the error message as shown in the screenshot 
>
> *Expected behavior*
> The {cmd} is executed in the configured shell.
>
> *Screenshots*
> [image: 'Program' is not recognized as an internal or external command: 
> quoting issues...] 
> <https://user-images.githubusercontent.com/37639058/65081954-1237f880-d9a5-11e9-8c29-2ed96b7f7c2b.png>
>
> *Environment:*
>
> VIM - Vi IMproved 8.1 (2018 May 18, compiled May 18 2018 18:36:07)
> MS-Windows 32-bit GUI version with OLE support
> Included patches: 1
> Compiled by mool@tororo
> Huge version with GUI.  Features included (+) or not (-):
> +acl                +channel            +cryptv             -ebcdic           
>   +folding            +lambda             +mksession          +ole            
>     +python3/dyn        +statusline         -tgetent            +visual       
>       -xfontset
> +arabic             +cindent            +cscope             +emacs_tags       
>   -footer             +langmap            +modify_fname       +packages       
>     +quickfix           -sun_workshop       -termresponse       +visualextra  
>       -xim
> +autocmd            +clientserver       +cursorbind         +eval             
>   +gettext/dyn        +libcall            +mouse              +path_extra     
>     +reltime            +syntax             +textobjects        +viminfo      
>       +xpm_w32
> +autoservername     +clipboard          +cursorshape        +ex_extra         
>   -hangul_input       +linebreak          +mouseshape         +perl/dyn       
>     +rightleft          +tag_binary         +timers             +vreplace     
>       -xterm_save
> +balloon_eval       +cmdline_compl      +dialog_con_gui     +extra_search     
>   +iconv/dyn          +lispindent         +multi_byte_ime/dyn 
> +persistent_undo    +ruby/dyn           +tag_old_static     +title            
>   -vtp                
> -balloon_eval_term  +cmdline_hist       +diff               +farsi            
>   +insert_expand      +listcmds           +multi_lang         -postscript     
>     +scrollbind         -tag_any_white      +toolbar            +wildignore   
>       
> +browse             +cmdline_info       +digraphs           +file_in_path     
>   +job                +localmap           +mzscheme/dyn       +printer        
>     +signs              +tcl/dyn            +user_commands      +wildmenu     
>       
> ++builtin_terms     +comments           +directx            +find_in_path     
>   +jumplist           +lua/dyn            +netbeans_intg      +profile        
>     +smartindent        -termguicolors      +vertsplit          +windows      
>       
> +byte_offset        +conceal            -dnd                +float            
>   +keymap             +menu               +num64              +python/dyn     
>     +startuptime        +terminal           +virtualedit        +writebackup  
>       
>    system vimrc file: "$VIM\vimrc"
>      user vimrc file: "$HOME\_vimrc"
>  2nd user vimrc file: "$HOME\vimfiles\vimrc"
>  3rd user vimrc file: "$VIM\_vimrc"
>       user exrc file: "$HOME\_exrc"
>   2nd user exrc file: "$VIM\_exrc"
>   system gvimrc file: "$VIM\gvimrc"
>     user gvimrc file: "$HOME\_gvimrc"
> 2nd user gvimrc file: "$HOME\vimfiles\gvimrc"
> 3rd user gvimrc file: "$VIM\_gvimrc"
>        defaults file: "$VIMRUNTIME\defaults.vim"
>     system menu file: "$VIMRUNTIME\menu.vim"
> Compilation: cl -c /W3 /nologo  -I. -Iproto -DHAVE_PATHDEF -DWIN32  
> -DFEAT_CSCOPE -DFEAT_TERMINAL -DFEAT_NETBEANS_INTG -DFEAT_JOB_CHANNEL   
> -DFEAT_XPM_W32   -DWINVER=0x0501 -D_WIN32_WINNT=0x0501 /MP -DHAVE_STDINT_H 
> /Ox /GL -DNDEBUG /arch:IA32 /Zl /MT -DFEAT_OLE -DFEAT_MBYTE_IME -DDYNAMIC_IME 
> -DFEAT_GUI_W32 -DFEAT_DIRECTX -DDYNAMIC_DIRECTX -DFEAT_DIRECTX_COLOR_EMOJI 
> -DDYNAMIC_ICONV -DDYNAMIC_GETTEXT -DFEAT_TCL -DDYNAMIC_TCL 
> -DDYNAMIC_TCL_DLL=\"tcl86t.dll\" -DDYNAMIC_TCL_VER=\"8.6\" -DFEAT_LUA 
> -DDYNAMIC_LUA -DDYNAMIC_LUA_DLL=\"lua53.dll\" -DFEAT_PYTHON -DDYNAMIC_PYTHON 
> -DDYNAMIC_PYTHON_DLL=\"python27.dll\" -DFEAT_PYTHON3 -DDYNAMIC_PYTHON3 
> -DDYNAMIC_PYTHON3_DLL=\"python36.dll\" -DFEAT_MZSCHEME -I "E:\Racket\include" 
> -DMZ_PRECISE_GC -DDYNAMIC_MZSCHEME 
> -DDYNAMIC_MZSCH_DLL=\"libracket3m_a36fs8.dll\" 
> -DDYNAMIC_MZGC_DLL=\"libracket3m_a36fs8.dll\" -DFEAT_PERL 
> -DPERL_IMPLICIT_CONTEXT -DPERL_IMPLICIT_SYS -DDYNAMIC_PERL 
> -DDYNAMIC_PERL_DLL=\"perl524.dll\" -DFEAT_RUBY -DDYNAMIC_RUBY 
> -DDYNAMIC_RUBY_VER=24 -DDYNAMIC_RUBY_DLL=\"msvcrt-ruby240.dll\" -DFEAT_HUGE 
> /Fd.\ObjGXOULYHTRZi386/ /Zi
> Linking: link  /nologo /subsystem:windows,5.01 /opt:ref /LTCG:STATUS 
> oldnames.lib kernel32.lib advapi32.lib shell32.lib gdi32.lib  comdlg32.lib 
> ole32.lib uuid.lib /machine:i386 gdi32.lib version.lib   winspool.lib 
> comctl32.lib advapi32.lib shell32.lib  /machine:i386  libcmt.lib oleaut32.lib 
> user32.lib  /nodefaultlib:lua53.lib  /STACK:8388608  
> /nodefaultlib:python27.lib /nodefaultlib:python36.lib   
> "E:\ActiveTcl\lib\tclstub86.lib" WSock32.lib xpm\x86\lib-vc14\libXpm.lib 
> /PDB:gvim.pdb -debug
>
>
>    - OS: Windows 10 Home Version 1903 OS build 18362.295 
>    - Terminal: GUI 
>    - Git: version 2.22.0.windows.1 
>    - Mintty: mintty 3.0.1 (x86_64-pc-msys)
>    Type: xterm 
>
> —
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