How to delete recent opened file session on Visual Studio Code?

I opened few files during coding (both files in project and out project). After that, I close few in its (by ctrl+w and click the 'x' button). When type ctrl+tab, I always see all opened files.

I try to restart VSCode, restart Windows but nothing change.

How do I close unnecessary files?

I use VS Code 1.0 + Windows 10.

Edit: This feature added in new versions

If you want to clear a specific item (not the whole list) from the recently opened list you have to

1. Press Ctrl + SHIFT + P
2. Type Remove From History (in earlier version it is Remove From Editor History) and press Enter
3. Choose/Find the file you want to clear

Source: link

Update 09.04.2020:

With the release of Visual Studio Code 1.44.0 you can easily remove a file using the UI. You see a closing x next to a file in this recently opened files view:

I could be mistaken but you don't want to delete, but "clear" recently opened files. If that is the case, then follow these steps in regards to VS Code version 1.15.0:

• Press Ctrl + Shift + P
• Then, within the Quick Open bar, type in >Clear Recently Opened
• Press Enter, restart Visual Studio Code, and you should now see nothing under Recent.

Cmd + Shift + P
Clear Editor History

For latest Visual Studio Code (1.54.2):

1. View-Command Palette or Ctrl + Shift + P
2. in the Command Palette dialog box: File: Clear Recently Opened
3. Restart Visual Studio Code