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TLB IDL
File conversion

Convert TLB to IDL

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

The type library can be decompiled back to IDL (Interface Definition Language) source using the Windows SDK OleView.exe (File > View TypeLib, then save as .idl) or the command-line MIDL /header and tlbimp tools. The result is human-readable interface definitions.

Also to IDL: XPT

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Tested on macOS, Windows & Linux
Last verified Oct 2026

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How to convert TLB to IDL

Converting a .TLB 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 .TLB 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

.TLB OLE/COM Type Library

A TLB file is a Windows COM/OLE Type Library - a binary file that lists the interfaces, methods, and types a COM component exposes. End users never need to open one manually; Windows loads…

Open .TLB 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 →