Questions tagged [file-format]

File format refers to the way information and data is encoded and stored in a computer file.

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49
votes
12answers
4k views

Where to find information about a file format?

Let's say I found 'some' file (might be an executable, might be data, or something else) and want to run or read it. I open this file in a text editor, but the format isn't readable. Examples include: ...
4
votes
2answers
426 views

Why does an executable give an error when opened in $tool?

I have an executable that runs in the operating system, but when when I open it in $tool I get an error. What is going on?
0
votes
2answers
248 views

How to identify the structure of this specific data file? [closed]

What is the structure of this database file from an old videogame? https://www.dropbox.com/s/ioe26pi3y1w3320/TMDATA1.S8?dl=0 Apologies in advance because fixing specific problems is not really the ...
25
votes
2answers
17k views

How to reverse engineer a proprietary data file format (e.g. Smartboard Notebook)?

How should I begin trying to reverse engineer this file format? The only thing I can think of is saving a simple file, and then dig in with a hex editor. But since the file format may be some kind of ...
21
votes
4answers
18k views

Firmware analysis and file system extraction?

I'm trying to analyse the firmware image of a NAS device. I used various tools to help the analysis (binwalk, deezee, signsrch, firmware-mod-kit which uses binwalk AFAIK), but all of them have been ...
17
votes
3answers
3k views

Automated tools for file format reverse engineering?

Are there any tools available to help automate the process of reverse engineering file formats? In particular, I'm interested in tools that use dynamic analysis of an application to parse the format, ...
10
votes
1answer
4k views

Where could one find a collection of mid-file binary signatures?

While reading an answer to another question, it was mentioned that "78 9C" was a well-known pattern for Zlib compressed data. Intrigued, I decided to search up the signature on the file signature ...
11
votes
3answers
12k views

How should I determine the format of this audio file?

I have an audio file in an unknown format. How should I try to determine its format ? Also, is it possible to do this by manual observation and not using any automated tool ?
4
votes
2answers
603 views

Reverse engineering file format - ImageLink

I have some technical documentation which is supplied in the form of a generic Windows viewer and a database. The database contains different "books", which are represented by a bunch files: book.bbi ...
4
votes
2answers
5k views

Need help extracting data from .dat file

https://dl.dropboxusercontent.com/u/247623/item.dat This is a file from a Java game, and I would like to know how to legible string data from it. I would prefer if only hints were given to me. I ...
3
votes
1answer
2k views

What are the steps, to extract an unknown archive file in this case?

I've never did something like this before, but I have programming experiences. There are two files: data00.big and data01.big, which I would like to extract. I've tried Dragon Unpacker, which can ...
1
vote
0answers
260 views

Reading stp (Designaknit Stitch Pattern)-Files

I want to write a small knitting program for my wife. In it, I will also read * .stp files (Stitch pattern). These are small files containing a graphic created by the program DesignaKnit and many of ...
4
votes
1answer
3k views

Find file signatures inside an unknown file

I have a .bin file I would like to analyse. Especially find images embedded in this firmware update. binwalk couldn't find anything. What other tools do you know to search for possible embedded ...
3
votes
3answers
934 views

Finding end of file

I have got a file which contains other files. I know where the subfiles start (header) but how do I know where the subfiles end ? Edit: Files are like: sound files (.wav) and images (.bmp, png, jpeg) ...
2
votes
2answers
417 views

Attempting to reverse engineer an iOS OTA payload-like archival format

Apple's announcement of macOS Big Sur had meant the release of the developer beta. In an attempt to create the appbundle from Apple's softwarecatalog, I attempted to study the contents of ...
1
vote
2answers
230 views

Opening an undocumented 90s graphics format

I've managed to extract some graphics files from an archive of an old game. Haven't found anything about it online, so I'm trying my luck here, prehaps someone knows a similar format that can help me. ...
1
vote
2answers
185 views

Given the files and their parsed content how can I reverse engineer the file format? [closed]

I have access to a few thousand binary files and I don't have the program that generated them. The files have been parsed and I also have access to the database where the parsed fields are stored. How ...