gVim in windows(10): external command cannot keep current work directory

[lymslive]

_Instructions: I switch to work in windows, find this problem that different from in linux.

Describe the bug
When execute external command, include :!cmd, :call system('cmd') and :terminal,
the current directory is always jump to c:\windows\system32

To Reproduce
Detailed steps to reproduce the behavior:

1. Run gvim c:\users\me\_vimrc (or open gvim to edit any plain file)
2. Type :!dir will list lost of file in c:\windows\system32
3. Type ':terminal' will open a cmd shell with pwd is c:\windows\system32
4. I've install gtags plugin, :!global -pq' cannot find the GTAGS of my project, also output c:\windows\system32`

Expected behavior
External command should keep current directory, as in linux do.

Environment (please complete the following information):

• Vim version (8.1, download binaray from office website vim.org)
• OS: windows10

**Addition:

• It still happens when start gvim by `gvim --clean'
• I've try set shell=powershell, not solved either

[k-takata]

Does it happen when you execute Vim with gvim --clean?

[chrisbra]

Have you tried the build from vim/vim-win32-installer?

[lymslive]

I've just download the latest release from https://github.com/vim/vim-win32-installer/releases
but now solve my problem.

I also try :set shellcmdflag=/d\ /c, but the /d flag to cmd.exe seams not take effect.
However when try neovim, add /d flag to &shellcmdflag, it work!
(yes, the cmd.exe in my windows system has a autorun to change current directory to system32, /d should disable it)

maybe this is bug where fixed in neovim?

[k-takata]

I suspect that this is caused by your settings or plugins. Please try with gvim --clean as I wrote above.

[lymslive]

I suspect that this is caused by your settings or plugins. Please try with gvim --clean as I wrote above.

I've try it, it not the reason.

[k-takata]

Ah, I'm not aware that you edited the comment.
Then, does :pwd show the correct directory?

[lymslive]

I'v try many cases and will summarize some report:

After read cmd /? help, I found there is a autorun action due to registry HKEY_LOCAL_MACHINE\Software\Microsoft\Command Processor\AutoRun which will cd c:\windows\system32', and the /d` switch will disable such autorun.

As I have no privilege to delete the AutoRun registry, I first try to change the vim option :set shellcmdflag=/d\ /c, but not solve it as mentioned above. Because in vim the external command is run through vimrun.exe, and this vimrun.exe seems also subject to that AutoRun registry cd to c:\windows\system32'. Finally I delete(rename) vimrun.exe, then in vim the system()function will work for my plugin, while:!` command has different behavior but not import.

** Summary option setting:

set shellcmdflag=/d\ /c
set noshelltemp

and disable vimrun.exe

** Conclusion / Suggestion

It is tricky vimrun.exe subject to AutoRun registry, it's better to imply /d switch to run cmd.exe .