Toshiba Portege R100 User Manual - Page 80

80 Learning the Basics Saving your work The Windows XP operating system supports file names of up to 255 characters; the names can include spaces. Some applications still require MS-DOS® file names. File names If you plan to share your files with a computer using a preWindows® 95 version of the Windows operating system, the file name must be no more than eight characters long. Typically the file name also has an extension, consisting of a period and up to three additional characters. You may use all the letters and numbers on the keyboard plus these characters and '. MS-DOS® file names are not case-sensitive and must not contain spaces. Using a file extension Most programs assign an extension to the file name that identifies the file as being created in the program with a particular format. For example, Microsoft Word saves files with a .doc extension. Any file name with an extension of ".doc" is assumed to be a Microsoft Word file. Creating your own extension is usually unwise, since the program is unlikely to recognize a strange extension and may refuse to handle your file correctly.