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IDL File - What is an .idl file and how do I open it?

Learn about .IDL files and view a list of programs that open them.

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What is an IDL file? Source code file created using the Microsoft Interface Definition Language (MIDL); contains interface and type library definitions; used for defining interfaces between client and server applications; also used for generating type libraries ( .TLB files) for OLE automation.

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Microsoft Visual Studio 2010 Icon

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DeveloperMicrosoft
Popularity3.6 | 5 Votes

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.IDL File Extension

Interface Definition Language File

DeveloperMicrosoft
Popularity
3.6  |  5 Votes
 

What is an IDL file?

Source code file created using the Microsoft Interface Definition Language (MIDL); contains interface and type library definitions; used for defining interfaces between client and server applications; also used for generating type libraries ( .TLB files) for OLE automation.

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Programs that open or reference IDL files

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Microsoft Visual Studio 2022

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Microsoft Platform SDK

Category: Developer Files

Updated: July 8, 2010

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What is an IDL file?↓
Source code file created using the Microsoft Interface Definition Language (MIDL); contains interface and type library definitions; used for defining interfaces between client and server applications; also used for generating type libraries (.TLB files) for OLE automation.

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