What is Ctrl + F4 keyboard shortcut for?

Windows 11 - Close the active document (in apps that are full-screen and let you have multiple documents open at the same time)  

Brave (Windows) - Close the current tab  

Opera - Close active tab  

Google Chrome - Close the current tab  

DOSBox - Update cached information about mounted drives. Useful if you changed something on a mounted drive outside of DOSBox. Also cycles through disk images mounted using IMGMOUNT  

Windows XP - Close active document or tab in a program  

Firefox - Close tab  

Mozilla Thunderbird - Close tab  

Vivaldi - Close tab  

Maxthon - Close the current tab  

Microsoft Word 2019 - Close the window  

Nuance Power PDF - Close the document  

FocusWriter - Close  

PSPad - Close  

Scrivener 1.9.9 - Close project  

Adobe Acrobat 2017 (Windows and Unix) - Close current document  

WordPerfect X8 - Close  

Notepad2 - Close file, identical with Ctrl + N  

Microsoft FrontPage - Close a Web page.  

Microsoft FrontPage - Close the active window.  

Substance Painter - Close project  

CorelDRAW 2020 - Close Window  

Navisworks Freedom 2020 - Toggles the docking window for the currently active graphics system (i.e. the Autodesk Rendering window ).  

Paint.NET - Close image  

Inkscape - Close the dialog  

Inkscape - Close document window  

ProgeCAD - Close window  

Enterprise Architect 14 - Close the current window.  

DraftSight 2019 - Exit the drawing  

ACDSee - Closes the current item  

KDE Plasma Desktop - Switch to Desktop 4  

SECURECRT 8.7 - Close current tab  

Royal TS - Close document  

VMware Workstation 5.0 - Close the summary/console view for the selected virtual machine.  

Visual Studio Code (Windows) - Close  

Unreal Engine 5.0 (early access) - Close major tab  

Spyder 4.1.5 - Close file 2  

NetBeans - Close selected window  

Roblox Studio - Close  

SQL Server Management Studio (SSMS) - Close the current MDI child window  

SQL Server Management Studio (SSMS) - Close  

SQL Server Management Studio (SSMS) - Closes Activity Monitor  

Sublime Text 4 - Close file  

Android Studio - Close active editor tab  

Total Commander - Sort by extension  

7-Zip - Sort items by type  

WinSCP - Sort files in the active panel by extension  

Xyplorer - Close Tab  

Xyplorer - Close current tab  

Adobe Bridge CC - Output  

PeaZip - Browse desktop  

BSPlayer - Close movie  

Winamp - Close (hide) graphical equalizer  

AIMP - Close playlist  

Corel Photo-Paint 2021 - Close window  

Command & Conquer: Generals - Camera bookmark  

Microsoft Flight Simulator 2020 - Toggle Drone Auto Exposure  

Microsoft Flight Simulator 2020 - Propeller Pitch Hi  

Command & Conquer: Yuri's Revenge - Bookmark creation  

Command & Conquer Remastered Collection - Set camera bookmarks  

Lock On: Modern Air Combat - Chase View  

Caesar III Heaven - Remember map view location  

Oxygen Not Included (PC) - Debug Instant Build Mode  

Tibia - (Healing / Support) HMM  

Battlezone 98 Redux - Select player / mapped group  

NewsBin Pro - Close window  

KeepassXC 2.6.4 - Close database  

Comodo IceDragon - Close Tab  

FL Studio 20 - Next empty pattern  

REAPER - Close current project tab  

Microsoft Excel 2019 - Closes the selected workbook window  

Studio One 5.4 - Close  

MetaTrader 5 - Close the current chart window  

Sumatra PDF - Close current document  

Vegas Pro 18 - Close the current project  

Cakewalk by Bandlab - Close current floating window  

Cakewalk by Bandlab - Close project  

Ninja Trader 8 - Risk-reward  

Altium Designer - Close active document  

Rhino 6 - SetMaximizedViewport > Perspective  

Eplan Platform 2.9 - Close graphical editor  

Originlab Origin 2020 - Close the active worksheet / graph / matrix window  

FreeCAD 0.18 - Close window  

Sparx Systems Enterprise Architect 16.1 - Close the currently active window  

CircuitStudio - Close active document  

Maple - Close Current Worksheet  

Solidworks 2019 - Close file  

CEREC 4.0x - Design phase  

CNC12 Mill Operator - Aux Key 4