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

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56
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4answers
10k views

What is a Codec (e.g. DivX?), and how does it differ from a File Format (e.g. MPG)?

I'm so confused... what is the difference between an audio/video codec (which apparently is a shorthand for "encoder/decoder", kind of like how "modem" is really "modulator/demodulator") and an ...
28
votes
8answers
37k views

JPEG vs PNG vs BMP vs GIF

I would like to know which one of these formats requires less memory for the same quality of the picture, and what are the main differences between these formats.
5
votes
2answers
9k 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 ...
12
votes
2answers
6k views

True difference between Excel CSV and Standard CSV

What is the true difference between an Excel CSV and a standard CSV? For example, when handling columns with line breaks inside one cell, how do they encode it differently?
3
votes
1answer
3k views

How can I view Mac OS X Parental Control files with format .data?

OS X stores Parental Control logs in /Library/Application Support/Apple/ParentalControls/Users/[username]/year/month with the extension .data. For example, 15-usage.data contains usage data for the ...
16
votes
5answers
36k 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 ?
12
votes
1answer
17k views

What are .md files?

I often see files with a ".md" extension. I usually open them with a text editor like Gedit and I can read them just fine. So – why do they use .md files and not say .txt files? Can somebody explain ...
5
votes
4answers
602 views

What is a “file format”? [closed]

What do we mean by a "file format"?
2
votes
1answer
245 views

Is Workbook.FileFormat available to the Excel UI (specifically when the file type can't be saved)

As a programmer I eventually located the file type of a .d extension file loaded successfully by Excel 2007 by interrogating Workbook.FileFormat via VBA, but can a normal user determine it is a DBF4 ...
5
votes
3answers
1k views

Math equation formats

I need to store equations in a text file, in a source format that can be converted to something that can be rendered (e.g. mathML). I like the format used in OpenOffice. I don't want to use TeX, or at ...
3
votes
1answer
1k views

What are the .efires files on OS X Lion's Recovery HD?

If you mount the Recovery HD that enables OS X Lion File Vault 2, Safari mode, and certain recovery options, you see several .efires files. What format are those and what do they contain?
5
votes
1answer
822 views

How to set default file format for MS Paint [duplicate]

Possible Duplicate: Lower case file extension in MS Paint I'm using MS Paint on WinXP at work, for capturing simple screenshots. Problem: MS Paint always wants to save in BMP format. How ...
2
votes
3answers
639 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 ...
1
vote
1answer
113 views

How to view LuraWave images on Linux?

I have a number of images I compressed as LuraWave before I knew about advantages of open formats in general and Jpeg2000 or c44 in particular. What is the simplest way to view *.lwf images in Linux? ...
0
votes
4answers
509 views

video formats: .3gp to .wmv converter [closed]

preferably free, either a program or online conversion