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File without extension - so you have to find out the file type

  • Nov 07, 2025
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If you want to find out of a file without the extension, the file type, you come with the Windows not too far. In such a case, the small Freeware Tool TrIDNET can help you.

TrIDNET set up

Before you can use TrIDNET, you must set up the Tool in the first place. To download from the official Website of the files trid_net.zip and triddefs_xml.rar down.
  1. Unpack the archive "trid_net.zip" in any folder on your hard disk.
  2. You create in the program directory to a new directory and unzip the contents of the "archive trid_net.zip" in this folder. After that, start the "TrIDNet.exe".
  3. The bottom right, click on the Button "Browse..." and specify the directory in which you have the "triddefs_xml.rar" unpacked. Then click on "Rescan Defs".
TrIDNET set up

TrIDNET: file type of Files without extension to find out

You want to find out the file type of a file, click TrIDNET on the top right on the Button "Browse...". Then, you open the file. Alternatively, you can drag the file into the program window. In the middle of the program window you will now see a list of all possible file types.
Type of file with TrIDNET find out
In addition, we have another article for you to describe how you file extensions under Windows 7 and Windows 8, change.

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