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XPT IDL
File conversion

Convert XPT to IDL

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Is it possible to convert XPT to IDL?
Yes - XPT converts to IDL.

XPT can be decompiled back to approximate IDL using xpt_dump from Mozilla build tools, which prints a human-readable interface description.

Also to IDL: TLB

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Tested on macOS, Windows & Linux
Last verified Oct 2026

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How to convert XPT to IDL

Converting a .XPT file to .IDL lets you open the content in software that prefers the .IDL format, though some details may change compared with the original. We are still putting together the list of programs that handle .XPT files.

A full step-by-step guide for this conversion is on the way; the information above is drawn straight from our database.

About these formats

.XPT XPCOM Type Library File

An XPT file is a compiled XPCOM Type Library - a binary file that described component interfaces for Mozilla applications like Firefox and Thunderbird. Since Firefox 57-58 (2017-2018),…

Open .XPT details →
.IDL Visual Studio Visual C++ interface definition library file

A .IDL file is associated with Visual Studio Visual C++ interface definition library, a developer file.

Open .IDL details →