• VSCode Version: 1.8.0
• OS Version: Windows 10

Steps to Reproduce:

1. Create and open a test_folder in VSCode.
   

2. Add an XML file encoded in UTF-16 LE.
   

3. Add a javascript file encoded in UTF-8.
   

4. Make sure both files are closed. Then search for text that can be found in both files. Note that only the javascript file is actually listed in the results.
   

Note: The XML file encoded in UTF-16 LE is found only if it is currently open in VSCode.