Opening an FDT File

The FDT file type is primarily associated with Apache Lucene.

FDT	File extension: FDT
	File type:	data file

What is an FDT file?

FDT files mostly belong to Apache Lucene.

The FDT file is used in several distinct applications. Its structure and purpose depend on the software that created it.
Consider these examples:

• Lucene field data file – Employed by Apache Lucene to hold field information that speeds up search indexing and sorting.
• Flattened Device Tree file – Contains hardware configuration data for embedded systems. This file helps bootloaders and operating systems know how hardware is set up.
• Device configuration file – Managed by tools like FDT Manager (linked with Yokogawa Field Data Trend) to save settings for device monitoring.
• Camera or PLC data file – Linked to Fujifilm cameras and Omron PLC systems, it stores device-specific data.
• Fluorescence data file – Generated by instruments such as Hitachi spectrophotometers (Hitachi) to record measurement data.
• Template/Definition file – Sometimes used by FileMaker Pro as a Fingerprint Data Template or Font Definition Table (Claris).

FilExt.com tips: FDT files are not universal text files. Their interpretation and usage rely on the originating software. To view or edit one, use a dedicated application or tool geared for that specific file type. For instance, decompiling a Flattened Device Tree may require a device tree compiler, while Lucene files are best handled by search index utilities.

How to open FDT files

You need a suitable software like Apache Lucene to open an FDT file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your FDT file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a FDT file directly in the browser:. Just drag the file onto this browser window and drop it.

Online FDT Text Viewer

Choose your .fdt file to analyze

or drag and drop it here

Online File Viewer

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FDT file format:

Every file has a defined file format, i.e. how the data is arranged in the file. Often, the file format can be deduced from the file extension or the initial bytes (called the signature). Nonetheless, different programs can utilize the same file extension to represent distinct file formats. Double-clicking on the file often results in an error when opening. If there are problems opening a file, you must first determine the file format used. Our examination of the FDT files comes to the following conclusion:

The FDT file ending does not have a uniform file format. The file formats most commonly found in FDT files are:

• 20% of all FDT files start with the bytes ?×l crucial for this file format. They consist of unreadable binary data. FDT files are between 1 KB and 68 MB in size. This file type is new and state-of-the-art. Certain words are almost always found in the files, such as Lucene50StoredFieldsFastData. The file name _0.fdt is typical for these files.
• 6% of all FDT files start with the bytes S00 crucial for this file format. These files are text files, so they contain words and text. FDT files are between 840 bytes and 4 MB in size. The files contain the following words: FDT. S20180601.FDT is a typical file name.

All other FDT files (74%) have different formats, the following 5 formats exist: IIHIDTAG. Often described as task, data, rest, requisition, firmware, imagined, template, emotion, eeglab, hiring or form. You can get all the details of your FDT file by dragging it onto this page or by clicking the button "Choose your .fdt file to analyze" above.