Questions tagged [file-format]

A file format is a particular way that information is encoded for storage in a computer file.

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7 votes
5 answers
49k views

How do I open a CAB file on Mac OS?

How do I open a CAB file on Mac OS X?
9 votes
2 answers
12k views

Is it ok to rename webm (audio-only) files to .opus?

For .webm files obtained with youtube-dl -f bestaudio containing no video stream, is it preferable to run: ffmpeg -i input.webm -vn -c:a copy output.opus Or can one simply rename the source file, ...
0 votes
1 answer
566 views

How can I get a video URL list (e.g. YouTube playlist) as a playlist file (for media players)?

Following these steps has gotten me almost all the way: I can get a text file of YouTube URLs from a YouTube playlist by using this https://thetubelab.com/get-all-urls-of-youtube-playlist-channel/ ...
4 votes
1 answer
5k views

How to tell if an internet video is Flash or HTML5 (or something else if there is such thing)?

I have some problems with Opera and Chromium browsers playing some streams and I want to debug that. But I cannot tell what works and what does not because I cannot tell what format a given stream is ...
12 votes
4 answers
3k views

I can't tag my AAC files with meta-data; what can I do instead?

I have an AAC file which I want to tag with information (artist, title, track number, album title etc.) ; unfortunately - it seems AAC does not support most of these tags, and tagger apps refuse to ...
1 vote
2 answers
46 views

How to determine bits per channel in XPM (X PixMap) image format?

Looking at the XPM (X PixMap) image format, I don't see anywhere that the number of bits per channel (or, equivalently, the number of possible colors) is specified. Poking around on my Ubuntu system, ...
2 votes
1 answer
226 views

Make a GIF image with an exact given byte size

For a specific task (replace an image inside a firmware without any data offset shifting), I need to create a GIF file of size 409x240 pixels of exactly 6449 bytes: offset 0-5: GIF89a (magic string) ....
1 vote
1 answer
546 views

How does Audible's .aa file format work?

When I download an audiobook from Audible, I get a bookname.aa file. When I open it with iTunes, iTunes shows me an authentication prompt where I need to enter my audible credentials. I presume the ...
3 votes
1 answer
644 views

How can I store a webpage title inside a Windows .url file?

This is a question about the .url file format: How can I store the webpage title inside a Windows .url file ? I was unable to find an official documentation of the .url file format anywhere on the Net....
0 votes
1 answer
978 views

Why do tabs in YAML work some but not at all times?

We've used tab-characters in some of YAML-files here: host: "foo" port: 8011 p: "bar" For some reason, the same version of Ansible running the same playbook works just fine with these files ...
2 votes
3 answers
2k views

GIMP 2.8.16 unable to open ORA files

I'm trying to edit/combine paintings I did in Krita with GIMP. Because GIMP can't open .kra files I saved them as .ora files. However, GIMP is unable to open any .ora files, including ones I made ...
0 votes
0 answers
4k views

Can I convert my octet-stream / text file to a jpeg?

I got a file with MIME type application/octet-stream, off the browser cache. I have a strong feeling it's a jpeg file that I want to open. First few files of the file: ÿØÿà �JFIF������ÿÛ�„� &...
3 votes
2 answers
173k views

How do I open a file with the file extension “FILE?”

From time to time someone sends a file that comes in the extension of .FILE. How do I change this or open this? I think they might be using Microsoft Word or something like at the office. I don't ...
0 votes
1 answer
15 views

ipod classic file With .VSp extension plays only on ipod, cannot convert

I have ipod classic 120GB. I installed a video file on it fron Sony camcorder(tape version) using Windows XP. The file extension indicates .VSP. Now this file only plays on ipod. I cannot convert it ...
0 votes
0 answers
77 views

Is there a way for the Game Capture app of Elgato HD60 S+ play a .ts file?

With OBS, we can add a VLC player to the broadcast, and since VLC can play a .ts file, we can add that. However, if using the Elgato Game Capture HD app, we can add a video, but it seems like it is ...
2 votes
1 answer
2k views

Why doesn't Microsoft Outlook fully support EML format, i.e. including email export? [duplicate]

EDIT: I am not asking HOW to save email from Outlook in EML format. Hence this question is not a duplicate of How to save a mail into an .eml-file with Outlook? ! I cannot find any relevant reference ...
1 vote
0 answers
96 views

How do I detect the format of a file LOCALLY on the command line?

I do not want to upload my private files anywhere. I do not have any use of anything which guesses the format based on the file extension. I'm trying to find some sort of utility which is able to let ...
2 votes
2 answers
2k views

Saving Skype voicemail messages on a Mac

I would like to save two voicemail messages that I received today through Skype. I would like to do this quickly and get the source file if possible, or at least get the source file to open in an ...
13 votes
2 answers
6k views

Is ISO 32000-2:2017 (PDF 2.0) really an open or free format? [closed]

Is it open? According to Wikipedia, PDF is an open format. But the ISO charges 198 Swiss francs for you to download the PDF 2.0 specification. Now according to free_file_format (first ref in the ...
12 votes
7 answers
7k views

Program to dump ID3 tag structure [closed]

Is there a program that would dump the complete structure of ID3v2 tags? Not just the frame names and values, but full information such as frame order, text encoding, description encoding (for TXXX ...
0 votes
0 answers
103 views

What is the right file signature?

I want to have a correct table of file signatures. I found two sites that have a big table of file signatures but when comparing those two, I saw that there was a different. For example, on this site, ...
10 votes
2 answers
19k views

Why are there no video formats that support transparency?

Why are there no [widely supported] video formats that support transparency? For example, the PNG image format supports transparency, allowing for some interesting effects in websites and documents. ...
0 votes
2 answers
608 views

How to assign a number on a text cell in excel

I need help. So I need to assign a number on a txt cell from excel. For example: the cell has the word Blouse. The word Blouse needs to have a value of 20 then I need to multiply this by $5. How can I ...
2 votes
1 answer
4k views

What is the difference between File Type and File Format?

I've some confusion regarding the File Type and File Format. Is it that Document is a File Type and PDF a file format? or Video is a File Type and MP4 is a file format ?
4 votes
4 answers
17k views

How to open/mount a BKF file?

Will the Microsoft Windows NT Backup - Restore Utility overwrite my files if I use it to open this file? How to use it under Windows 7? (Windows 7 doesn't have the Removable Storage Management feature ...
1 vote
1 answer
2k views

What makes two main JPEG file formats, JFIF and Exif, incompatible?

JPEG is not a file format. The two major formats are JFIF and Exif. Wikipedia page on JFIF says that: JFIF is mutually incompatible with the newer Exchangeable image file format (Exif). The two ...
3 votes
3 answers
2k views

Is there a disk image file format that only store sectors which are filled (non empty)?

I have a 500GB hard drive that contains several NTFS partitions. I would like to create a single disk image of all partitions. My ultimate goal is to mount that drive later and scan it for possible ...
55 votes
9 answers
156k views

Using Gimp to batch convert images to another format in Windows

As implied by the title, does anybody know how to use the gimp-console-[version].exe program to batch convert images between formats (with default settings) in Windows ?
0 votes
1 answer
361 views

filename extract and formatting

I have a lot of files in a folder \Testing, I'm trying to take the file name and format it inside the text file to a certain way. Example would be 111005000_10312019.pdf inside folder "Testing&...
69 votes
2 answers
17k views

What does Matroska have which WebM doesn't, that made the differentiation necessary?

I've read that WebM is essentially a subset of the Matroska format. What does Matroska support that WebM doesn't, which necessitated "christening" a new format rather than just saying "...
20 votes
4 answers
17k views

How do I open a "Acrobat X" document without the newest version?

When I open a certain PDF file I get the following error: For the best experience, open this PDF portfolio in Acrobat X or Adobe Reader X, or later. Get Adobe Reader Now! I have Foxit Reader 5.1....
3 votes
3 answers
5k views

Save Raw Image Data As Image

So, being the curious person that I am, I opened a PNG image in Notepad. I got this: ‰PNG IHDR ‰ sRGB ®Îé gAMA ±üa pHYs à ÃÇo¨d ÜIDAT8O­UMH[AþÞ‹Lý9•`¬bÞ9ääÁ›¥Jë¡ÁS©Äj«=‰Š’„@‰•x‘¢...
0 votes
1 answer
83 views

Is there an established file format for storing information needed to connect to a WiFi network?

In particular, I'm curious if there's a file format used to encapsulate an SSID and security information about a wireless network which would allow it to be (in theory) exported from one device and ...
0 votes
0 answers
188 views

How to open files with KMP as default?

I have downloaded some videos from Youtube. but their format is not KMP. It is "File". although when I right click on the file and click on "Open With" I can open it with KMP ...
47 votes
2 answers
73k views

EOL in Notepad++ and Notepad

I'm using Notepad++ to create some text file, but I noticed when the generated file is opened in Windows Notepad, the file contents get mal-formated due to the fact that Notepad++ use LF and EOL ...
0 votes
1 answer
677 views

Compress all files to the "9" level with gimp

I created the scripts from Using Gimp to batch convert images to another format in Windows tip made by @forrest-voight. Can anyone tell me how I can add options to this script so that the maximum ...
6 votes
2 answers
12k views

Convert old videos to have smaller sizes

I have some videos from a few years ago,with various formats, such as avi, mpg, wmv, rm, rmvb, .... Their sizes are huge(more than 500 MB, and sometimes > 1GB). Given there may likely be some advance ...
3 votes
2 answers
9k views

Unknown file format, need to open!

A friend recently handed me an old disc which should contain digitized old family photographs. The problem is, the disc was created by a photographer who scanned the photos back in 2003, and has since ...
35 votes
6 answers
145k views

What is the difference between WAV and FLAC?

My understanding is that the WAV and FLAC formats are containers for lossless audio. I have seen the FLAC format as being perhaps better because it is able to losslessly compress audio from say a WAV ...
21 votes
1 answer
6k views

What are these .000, .001, etc. files and how do I read them?

I have a set of files that mostly end with numerical extensions [sda2.000, sda2.001, etc.], which makes me think they are some kind of bulk backup of a drive. I have not been able to find any ...
0 votes
1 answer
414 views

In Windows, what are the purposes of file extensions?

As far as I know, in Linux filename extensions don't have any special meaning to the operating system. It helps users to identify the file, of course, but the OS itself simply does not care about it (...
1 vote
1 answer
133 views

How to dump Verity .ddd file to a text file?

I found this very helpful information about Verity database structure .ddd file - Verity Documentum? Now I want to migrate an old Verity database to a new application, therefore I'd like to dump ...
1 vote
1 answer
443 views

.ddd file - Verity Documentum?

I work in computer forensics - one of the data sets that I have recently been asked to analyse contains a number of .ddd files that I have so far been unable to open. Reading through these files in a ...
30 votes
3 answers
8k views

LibreOffice: How to save in Git friendly format?

LibreOffice saves into files that are zip files. Zip files are generally suboptimal to use with Git: A small change in the document can change most of the zip-file, thus making it impossible for Git ...
1 vote
1 answer
121 views

What file format to use for photos? I will edit them. Then I will add text and make a PDF

I want to shoot a few photos using the smartphone. I will receive JPEG files. Next step I will move this photos to desktop computer (Windows 10 Home 64-bit). Now I want to edit this photos: some of ...
0 votes
1 answer
114 views

Should files with the "hdr" file extension end with newline characters?

I'm writing a script that enforces file formatting. One of the things it does is ensures that all text files end with newline characters. One area which I'm unsure of is with .hdr files. These are ...
2 votes
1 answer
580 views

Deal with reserved characters when syncing volumes with different formatting

I have a NAS and I want to copy some directories on it to an exfat formatted external HDD. Problem is paths / filenames may contain reserved characters for exfat (see https://en.wikipedia.org/wiki/...
18 votes
1 answer
12k views

Inspect serialized file content

I have a file which apparently contains serialized structures. The first 26 bytes contain the string "java.util.HashMap", so I am sure that this file holds serialized data. Is there is nice tool ...
3 votes
1 answer
588 views

What is the sturcture of RW2 file?

Can any one tell me that the Panasonic's RW2(RAW Format) is based on TIFF or not ? The header is same as of old format (RAW).
0 votes
1 answer
19 views

Must every XML file/stream/etc begin with either a "<" character, or with a BOM followed by a "<" character?

I'm doing some filetype detection stuff and wanted to handle XML detection more robustly. I added support for an optional initial Unicode BOM (Byte Order Mark) followed by a < character in either ...

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