Files with xpt extension are in most cases XPCOm libraries for Mozilla Firefox web browser. Used for internal purposes.

There are 2 other file types using
the XPT file extension!

empty icon.xpt - eXact Packager model

empty icon.xpt - SAS transport (XPORT) data

Detailed description

Software that open xpt file

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XPT file extension - Firefox XPCOM type library

What is xpt file? How to open xpt files?

File type specification:

Various data file type icon Various data file type

xpt file icon: xpt filetype icon

The xpt file extension is used by Mozilla Firefox for XPCOM type libraries.

XPCOM Type Library (xpt fle) is used to add features and extensions to Firefox web browsers.

XPCOM type libraries, or "typelibs", are binary interface description files generated by the XPIDL compiler. Type libraries enumerate the methods of one or more interfaces, including detailed type information for each method parameter. Typelibs might be more aptly named "interface libraries", but Microsoft has already established a precedent with their naming scheme and so it suck with it to avoid developer confusion.

Ideally, XPCOM typelibs would be binary-compatible with those generated by Microsoft's MIDL compiler, but the MS typelib format is proprietary. Thus, this document specifies a format quite different from the Microsoft format.

Note that the typelib is not merely a tokenized form of the IDL. Rather, it's intended to accurately represent binary XPCOM interfaces, with annotations derived from the IDL.

The default software associated to open xpt file:

Firefox icon

Mozilla Corporation logoFirefox  Microsoft Windows software

Company or developer:
Mozilla Corporation

Firefox is very popular free open source web browser with many features. Firefox uses Gecko layout engine that implements most web standards including new HTML5.

Firefox supports tabbed browsing, private browsing, spell checking, incremental find, bookmarking etc. Other features can be added via extensions and add-ons, such as NoScript, Tab Mix Plus. FoxyTunes, Web Developer.

Firefox for Mac icon

Mozilla Corporation logoFirefox for Mac  Apple macOS / Mac OS X software

Company or developer:
Mozilla Corporation

Firefox for Mac is popular free web browser developed by Mozilla Corporation. Firefox uses Gecko layout engine to display internet web pages. Gecko supports many current web standards. Firefox features include tabbed browsing, spell checking, live bookmarking, private browsing etc.. New features can be added through extensions.

Firefox for Linux icon

Mozilla Corporation logoFirefox for Linux  Linux/Unix software

Company or developer:
Mozilla Corporation

Firefox for Linux is popular free Internet browser developed by Mozilla Corporation. Firefox uses Gecko layout engine to view web pages. Gecko supports many web standards, Firefox supports many features, such as tabbed browsing, spell checking, private browsing etc.. Another features can be added by extensions. In many Linux distributions, Firefox is pre-installed as a default web browser.

Help how to open:

This file type is not meant to be opened directly, there is no software that could open and work with it directly, or there is no information available in public sources about opening this file type. This is usually the case of some internal data files, caches, temporary files etc.

How to convert:

As far as we know, this .xpt file type can't be converted to any other file format. This is usually the case of system, configuration, temporary, or data files containing data exclusive to only one software and used for its own purposes. Also some proprietary or closed file formats cannot be converted to more common file types in order to protect the intellectual property of the developer, which is for example the case of some DRM-protected multimedia files.

List of software applications associated to the .xpt file extension

Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open xpt file, edit xpt file, convert xpt file, view xpt file, play xpt file etc. (if exist software for corresponding action in's database).

Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting xpt files.

Software that open xpt file - Firefox XPCOM type library

Programs supporting the exension xpt on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about listed programs for open xpt file action.

Microsoft Windows:

Main software associated with xpt file by default:
Firefox small icon Firefox
Other suggested software:
SeaMonkey small icon SeaMonkey

Apple macOS / Mac OS X:

Main software associated with xpt file by default:
Firefox for Mac small icon Firefox for Mac
Other suggested software:
Seamonkey for Mac small icon Seamonkey for Mac



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