A daily updated filename extension database!

T03 file extension

The table below provides useful information about the .t03 file extension. It answers questions such as:

  • What is the .t03 file?
  • What program do I need to open a .t03 file?
  • How can the .t03 file be opened, edited or printed?
  • How can I convert .t03 files to another format?

Table of Contents

We hope you find this page helpful and a valuable resource!

0 extension(s) and 1 alias(es) found in database

✅ TaxCut Federal Data

T01 file is a TaxCut Document. H&R Block TaxCut is a financial program. It is used to create and manage tax records.
T00 format description not yet available
Category: Data files
Application: TaxCut
Mime-type: application/octet-stream
Magic number: -
Magic string: -
Sample: -
T00 aliases:
t01, t02, t03, t04, t05, t06, t07, t08, t09, t99
T00 related links:
T00 related extensions:

Other types of files may also use the .t03 file extension.

🚫 The .t03 file extension is often given incorrectly!

According to the searches on our site, these misspellings were the most common in the past year:

f03, g03, h03, r03, t3, tp3, y03

Is it possible that the filename extension is misspelled?

We found the following similar file extensions in our database:

TADS 3 Compiled Game
MicroStation Modification System Resource File
Harvard Graphics 3.0 Template
Corel Paradox Secondary Index
HEC-RAS Flow File
HEC-RAS Geometry File
Flash ROM HEX File
WinRAR Archive

🔴 Can't open a .t03 file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:

Windows cannot open this file:


To open this file, Windows needs to know what program you want to use to open it...

If you don't know how to set the .t03 file association, check the FAQ.

🔴 Can I change the extension of files?

Changing the filename extension of a file is not a good idea. When you change a file's extension, you change the way programs on your computer read the file. The problem is, changing the file extension does not change the file format.

If you have helpful information about the .t03 file extension, write to us!

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