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Mac OS 7, 8, and 9 StartUp Screens

B&W StartUp Screens are bitmaps with a size of 512 by 342. The bitmap is stored on disk uncompressed. Colour StartUp Screens are PICT resources with ID=0 and can be any size.

Macintosh File Type of: SCRN

MS-DOS extension: no standard extension


MacPaint bitmaps are compressed black & white bitmaps with a size of 576 by 720.

Macintosh File Type of: PNTG

MS-DOS extension: ".MAC".
Where long extensions are possible, Apple seems to recommend ".pntg".

X11 File format:

The width and height of the bitmap are written as preprocessor symbols at the beginning of the file. The bitmap image is then written as an array of characters.

Here is an example of a bitmap file whose image spells X11. #define name_width 11

#define name_height 5

static char name_bits[] = {

0x91, 0x04, 0xca, 0x06, 0x84,

0x04, 0x8a, 0x04, 0x91, 0x04

}; Macintosh File Type of: TEXT

WWW mime_type:


Windows MetaFiles (WMF) & Placeable WMF

Windows Metafiles are Microsoft's version of the Macintosh PICT file format. It contains graphics commands to draw line, circles, etc. Placeable WMF are special header defined by Aldus Corp. to allow applications to correctly read, scale and draw WMF files.

See also MacOS XTND Translator for reading WMF files under MacOS.

Macintosh File Type of: WMFf or BINA

MS-DOS extension: ".WMF"

Portable Network Graphics (PNG)

PNG is an extensible file format for the lossless, portable, well-compressed storage of raster images. PNG provides a patent-free replacement for GIF and can also replace many common uses of TIFF. Indexed-color, grayscale, and truecolor images are supported, plus an optional alpha channel for transparency. Sample depths range from 1 to 16 bits.

WWW mime_type:


approved on 14 October 1996 by W3C.

Macintosh File Type of: PNGf

MS-DOS extension: ".PNG"

QuickTime(TM) Movie file

Played by QuickTime capable programs. QuickTime is available for Windows 3.1 and 95 and Macintosh from Apple Computers and Xanim for Unix. For details Cross-platform QuickTime page. On the Macintosh and Windows machine, you can use all the standard edit menu functions (Cut, Copy, Paste, and Clear), but only resources of type "MooV" can be pasted into a movie.
Note: This option requires QuickTime extension to be installed in the System Folder (System 7 or later in extensions folder) or Windows QuickTime DLL installed.

Macintosh File Type of: MooV

MS-DOS extension: ".MOV"

Use CTC Drag & Drop application to set the type to `MooV'.

WWW mime_type:


MPEG Movie file

MPEG is a standard for compressed digital video and audio.

Macintosh File Type of: MooV

Nobody standarized the file extensions yet, common use extensions are:

.mpg could be everything ;o) usally only Xing-format (only I-frame)

.mps MPEG-1 IPB Systemstream (video and audio)

.m1v MPEG-1 IPB only video or systemstream

.mpv MPEG-1 IPB only video (sometime even .vmp)

.mp2 MPEG-1 only audio (mostly layer 1 or 2)

.mpa MPEG-1 only audio (mostly layer 1 or 2) (sometimes even .amp)

.l3 MPEG-1 only audio (layer 3)

.m15 MPEG-1 IPB videostream at 15fps

.m75 MPEG-1 IPB videostream at 7.5fps

.mp4 MPEG-4 video and sound encoding with support for bitrates from 64Kbit to 1024kbits.

.mp3 Audio sound encoding.

WWW mime_type & extensions:


Note: QuickTime 2.x or later, supports tracks in MPEG 1 compression format under PowerPC MacOS only, QT 4.0 add support for MP3 audio streams under MacOS and Windows. And the anouncement of QuickTime 5 adds supports for MPEG1 and MPEG2 streaming and editing on both MacOS and Windows. QuickTime 6 adds support for MPEG4 playback and encoding. For more details on formats supported by QuickTime, check out: http://www.apple.com/quicktime/products/qt/specifications.html.

Common Graphics Formats: BMP || EPS || GIF || JPEG || Other formats || PICT || TIFF
Updated: 26 May 2003, By RMF