Lainaus:

---

Macintosh uses a file system that is set up with two logical "forks", the data fork and the resource fork. The data fork is the meat of the file, what we PC users would have. The resource fork contains resources such as sounds, icons, file types, etc., that are used with the file--this allows the users to view and edit resources, as well as making it easy on the file system. On a PC, it's safe to ignore this file for many data files (images, text documents, etc.). There are translator utilities to extract the necessary information for files that use resources.

Traditionally, Macintosh files don't have extensions because they don't need them. They have the catalog tree of the file system to contain that type of information for them. We need extensions. You can (1) try the common extensions (.jpg, .gif, .tif, .eps, .pict), in turn, until you find one that opens your file, (2) use a hex editor to open the files, check out the first part of the file, and determine the file type based on the bytes therein (the jpeg "yoya", the gif "gif", etc.), or (3) use a program that briefly analyzes the file and suggests its type for you, to easily determine what type these files are.

Method one may be easiest for you if it's a small handful of files, and it's likely that the files are all the same format--sending a hodge-podge of formats isn't convenient for most people. Also, Windows Explorer should show the image preview when the extension matches the file type if it's a jpg, gif, or tif (which is a good sporting chance).

---