Opening an OTX File

The OTX file type is primarily associated with Open Texture Extractor.

OTX	File extension: OTX
	File type:	data container file

What is an OTX file?

OTX files mostly belong to Open Texture Extractor. OTX files serve different roles depending on their origin. The most common use is as an Open Texture Library file generated by the Open Texture Extractor (OTX) tool. This file holds texture data that is often used in gaming or modding contexts.
Other uses include:

OpenTX model data file – This type is stored in a ZIP container and is used to back up radio settings. You can open these with standard ZIP tools. More details can be found at OpenTX.

Olivetti Text Document – A document file used with Olitext Plus. It can be opened with a text editor.

Terraria texture file – Used to store textures for the game or mods. Tools like tModLoader help view these files. Visit tModLoader for more info.

FilExt.com tip: This file extension is shared among unrelated applications. Checking the file header or content can help decide which application is needed.

How to open an OTX file

You need a suitable software like Open Texture Extractor to open an OTX 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 OTX file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a OTX file directly in the browser:. Just drag the file onto this browser window and drop it.

Online OTX Text Viewer

Choose your .otx file to analyze

or drag and drop it here

Online File Viewer

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OTX file format:

Each file has a definite file format, that is, how the stored 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. When there is a problem with a file, the first step to solving it is to determine the file format. Our examination of the OTX files comes to the following conclusion:

The OTX file type is primarily used by a single program. The two most popular formats are as follows:

• 65% of all OTX files start with the magic bytes Version 13 30 { Image , which are always the first bytes of this file format. The contents of these files can even be read by a human. OTX files can be up to 180 bytes in size, but are often around 130 bytes - 160 bytes. This file type is new and state-of-the-art. The files contain the following words: ExtraFlags 0, Image, Levels, Type Regular, Version 13 30, UsageFlags -, PixelFormat DXT1, Usage DIFFUSE, PixelFormat DXT5 and SPLIT. Such files are related to diff, policelogos, sheriff, prop, jbib, sign, normal, decxj and logo.
• 15% of all OTX files use the ZIP format, so multiple files are compressed and stored together in one OTX file. OTX files contain from 3 to 90 compressed files. If you want to see the included files and images, simply rename the file extension to .zip and double-click it. OTX files are between 670 bytes and 150 MB in size. The files contain the following words: RADIO/radio.bin. A usual file name is middle-earth-v1.1.otx. Files like these are sometimes connected to paramotor.

All other OTX files (20%) have different formats, often e.g. Olitext document. These files sometimes refer to backwallsnew, branding, concrete, office or bank. Drag & drop your file here to see the file format and a preview of your OTX file!