A test file extension is mostly used just for various testing files.

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TEST file - Testing file

What is test file? How to open test files?

File type specification:

Various data file type icon Various data file type

The test file extension can be used as a testing, sample, test file etc.

So it can be various data file type, simple text, programmer's source code file or anything else.

Updated: May 18, 2018

Help how to open:

First try to open it by any text viewer if it is text file type or find file headers to recognize this file type.

How to convert:

Conversion is not possible due to lack of information about this file format and it can be anything.

File-Extensions.org > Various data file types

 

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