Turbo Debugger for DOS configuration data
File type: Configuration file
A td file extension is related to the Borland Turbo Debugger a program debugging software. A td file stores configuration data.
Found 2 different file type records with the same td filename suffix.
File type category:
Configuration file
Date updated: August 5, 2019
Record marked as obsolete and not updated for a long time.
The td file extension is used for configuration files for the DOS based Borland Turbo Debugger. This program largely became obsolete with the advent of Windows.
It might still be possible to access a .tb file whilst running an early version of Turbo Debugger (version 1 is recommended) on a Windows DOS emulator.
Software apps that manage or store settings in td files:
Microsoft Windows
File type category:
Miscellaneous file
Date updated: September 27, 2026
Microsoft Train Simulator, developed by Microsoft for Windows, uses TD files to store terrain quad tree data. This data helps the simulator organize and manage terrain as it loads and displays a route.
A TD file is one component of a route and works with the route's other terrain and scenery files. It does not represent a complete route on its own.
The format is specific to the Windows version of Microsoft Train Simulator and is mainly encountered in existing routes and route-development files.
Microsoft Train Simulator opens TD files as part of the routes installed for it. Keep the file in its original route folder and start the route from within the simulator.
There is no need to open this file directly in a text editor or general-purpose application. Removing or moving it can prevent the associated route from loading correctly.
TD files are internal route data files and are not normally converted on their own.
When adapting a route, use a compatible Train Simulator route-development tool or edit the complete route rather than attempting to convert an individual TD file.
Software applications that handle other tasks involving td files:
Microsoft Windows
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