![]() EML is mostly a text format with support for different character encodings and binary data which are usually encoded in ASCII. eml files as they're transmitted, with their headers and attachments. Office Open XML files are based on OPC, a hierarchical file system stored in a zip file. With XLSX and PPTX, it's also one of the formats of Office Open XML, an ISO standard. docx The DOCX format is the native format of MS Word it's the successor of the DOC format. The DOC format is based on the Microsoft Compound Document file format, where binary file streams, identified by names and directories, are stored in a single file. doc The DOC format was the native format of MS Word it has been replaced by DOCX. dng The DNG format aims at replacing proprietary raw file formats produced by digital cameras with a common format based on TIFF. They contain compiled code and data which are loaded automatically when the application which requires them starts, or later when it requests them. dll Dynamic-link libraries are dynamic libraries for Windows. They are made of ar and tar archives compressed with gzip. deb Debian packages are a way to distribute software on many Linux distributions, such as Debian and Ubuntu. They contain a single table with the field definitions and the records, possibly with deleted records. They share the same format as ICO files, except for the meaning of cursor-specific fields (the position of the hotspot). The cpio format is used internally in RPM packages. cpio cpio files are archive files on unix and unix-like systems, similar to TAR but less common. Each file corresponds to a separate class (a kind of module in object-oriented programming languages). Metadata and streams are stored in objects, data subsets whose purpose is identified by a 16-byte globally-unique ID (GUID). ASF files contain one or more media streams, such as audio or video. asf ASF (Advanced Systems Format) is the multimedia format of Microsoft it's used for video (wmv) and audio (wma) files. They are also used internally for Debian packages (.deb). ar AR files are flat archives, typically used for static libraries on Linux. Here is a brief overview of the file formats recognized by Peek. Most links are internal cross-references, or let you extract data as a file if they have a file icon. You can dissect further elements displayed with a wheel icon by clicking them, or select the menu View>Analyze All. ![]() What “large” means depends on the file itself and on your computer typically files up to a few megabytes are very fast to parse. Peek doesn't dissect everything at once, because for some large files, it can take a while and clutter your display with information you may not be interested in. For instance a PDF document can contain images stored as JPEG. Peek doesn't change your files, doesn't execute them, doesn't send them to anybody. At least some metadata should be easy to spot. But the user interface is very simple: open a file with the File menu, or just drag and drop a file to the browser window, and Peek will happily work for you without further question. Unless you're familiar with file formats, some jargon will seem meaningless. Nevertheless, we think it can be useful to analyze files, to realize the amount of metadata some formats like MS Office or PDF contain and the privacy leaks they can cause, and maybe to better understand malware reaching your mailbox.ĭata displayed by Peek can be intimidating. Peek's feature set is incomplete and its user interface is a little bit rough. It relies on technologies Calerga has developed for other products, such as Sysquake js, and for projects for its customers, or uses itself internally. It runs entirely in a web browser on the client computer (your computer), without any connection to the server. Peek's purpose is to dissect a file and display its content in a hierarchical way.
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