If we run

gvim.exe  --remote-tab-silent  C:\test.txt

we will see some error message, while the file is opened properly.

Someone describe it here
http://stackoverflow.com/questions/30806729/vim-bug-remote-tab-silent-and-file-in-drive-root

I figure out that the problem is
https://github.com/vim/vim/blob/master/src/main.c#L4017-L4019

if we execute

gvim.exe  --remote-tab-silent  C:\test.txt

after escape, the final script is:

cd -|lcd -|elseif getcwd() ==# "C:\"|cd -|endif|endif<CR>


Maybe we can change it:

ga_concat(&ga, (char_u *)"cd -|lcd -|elseif getcwd() ==# \"");
ga_concat(&ga, cdp);
int len=strlen(cdp);
if(len>3 && cdp[len-1]=='\\' && cdp[len-2]==':'){
  ga_concat(&ga, (char_u *)"\\\"|cd -|endif|endif<CR>");
}else{
  ga_concat(&ga, (char_u *)"\"|cd -|endif|endif<CR>");
}

I have tested with hardcode `ga_concat(&ga, (char_u *)"\\\"|cd
-|endif|endif<CR>");`, it works for drive root files.

But I have no idea about char_u and multibyte, so the above is just pseudocode.

Could anyone help to solve it, thanks?

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