FileExt for Windows

Used FileExt for Windows?

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Editors’ Review

Download.com staffFebruary 26, 2026

FileExt is a comprehensive Windows help file that details over 1,580 file extensions. Instantly identify any file type and understand its associated application.

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Pros
- Extensive database of 1,580+ file extensions
- Provides clear descriptions for each extension
- Windows help file format
- Answers 'What kind of file is that?'
Cons
No Cons available

FileExt for Windows

Used FileExt for Windows?

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Full Specifications

GENERAL

Release: April 21, 1998

Latest update: February 26, 2026

Version: 4.0

OPERATING SYSTEMS

Platform: Windows

Operating System

Windows 10
Windows 3

Additional Requirements: Windows 3.x

POPULARITY

Total Downloads: 19,654

Downloads Last Week: 0

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User Reviews

5/5

3 User Votes

great, but didn't have "ext" that I needed
April 5, 2002
Pros
Cons
Summary
needed to know what rsm was and it wasn't listed. it did have numerous other files listed that were helpful
A very simple Windows-format Help file for filename extensions
September 1, 2000
Pros
Cons
Summary
Great! It helped me find what I needed.

Developer’s Description

Peruse a listing of hundreds of filename extensions.

FileExt is a vast Windows help file that lists and describes more than 1,580 filename extensions recognized by today's applications. You'll never again ask, 'What kind of file is that?'