• VSCode Version:
  1.8.0-Insider
• OS Version:
  Windows 10 64bit

Steps to Reproduce:

1. open a file in VSCode

2. Find In Files.
   I want to search some text in specific folder without opening the folder. But I find I can only search in the opening files, can not search in other files in the folder. I have to open the folder before searching some text in the folder.
   I hope VSCode can support find in specific folder without opening the folder in VSCode first.

   I can do this in almost all other editors, such as UE, Notepad++, Sublime Text.

Thank you!