EXD is a file format used by older versions of Microsoft Office suite. EXD files were commonly seen on Windows XP and Vista systems. Microsoft Office saved EXD files in dedicated folders.

EXD format was created as a solution ActiveX data buffering solution. EXD files are generated when an ActiveX control is inserted into Word, PowerPoint, Excel, or Visual Studio document. ActiveX components may be inserted into documents using built-in Toolbox module.