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Old 24 October 2014, 03:14   #1
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Location: Constanta / Romania
Posts: 202
Changing Icon Type

Following the discussion in: http://eab.abime.net/showthread.php?p=982493#post982493, I have not found a sensible way of changing the icon types for the icon archive at: http://aminet.net/package/pix/mwb/IconArchive short of having to use an icon editor, load each icon, change the type, save the icon, go to the shell and overwrite the .info type.

I looked up the specification of the different icon types on the Amiga and coded a small program that just changes the icon type of any .info file.

**    Copyright (C) 2014 Wizardry and Steamworks - License: GNU GPLv3    **
** Provided an input type and an .info file, this program change the type 
** of the icon. This is useful for icon packs where .info files would have
** to be converted manually using an icon editor.
** Reference: http://krashan.ppa.pl/articles/amigaicons/

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char **argv) {
	FILE *fp; 
	long size;
	char *info;
	int type;

	if(argc < 3) {
		printf("SYNTAX: %s <type> <info file>\n", argv[0]);
		printf("TYPE: 1 - disk or volume\n");
		printf("      2 - drawer (folder)\n");
		printf("      3 - tool (executable)\n");
		printf("      4 - project (data file)\n");
		printf("      5 - trashcan\n");
		printf("      6 - device\n");
		printf("      7 - Kickstart ROM image\n");
		printf("      8 - an appicon (from an app)\n");
		return 1;

	type = atoi(argv[1]);

	switch(type) {
		case 1: case 2: case 3: case 4:
		case 5: case 6: case 7: case 8:
		  printf("Unknown icon type.\n");
		  return 1;

	fp = fopen(argv[2], "rb");
	if(fp == NULL) {
		printf("The second argument must be an icon file.\n");
		return 1;

	// read size
	fseek(fp, 0, SEEK_END);
	size = ftell(fp);

	// allocate buffer and read
	info = (char *) calloc(size, sizeof(char));
	if(fread(info, 1, size, fp) != size) {
		printf("The file could not be read.\n");
		return 1;

	if((unsigned int)info[0] != 227 && (unsigned int)info[1] != 16) {
		printf("The file is not an icon file (info).\n");
		return 1;

	// change the icon type
	info[48] = (char)type;

	// open file for write
	fp=fopen(argv[2], "wb");
	if(fp == NULL) {
		printf("The file could not be found anymore.\n");
		return 1;

	// write the data
	fwrite(info, size, 1, fp);

	return 0;
I have attached the LHA containing the binary - just copy "seticontype" from the archive to c:

The usage is very simple:
  • open a shell
  • change directory to where you have the .info file
  • run: seticontype T icon.info where T is a type (printed out as reference when you run seticontype without arguments).
  • the icon.info will be changed to type T
  • you can then overwrite your old icon with the .info you just modified

Attached Files
File Type: lha seticontype.lha (7.9 KB, 99 views)
eva is offline  
Old 24 October 2014, 04:28   #2
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Location: Hangover
Posts: 2,407
I guess, you can do the same and much more with ProcessIcon option SIT (Set Icon Type) written by Dirk Stoecker. http://aminet.net/package/util/wb/ProcessIcon
PeterK is offline  
Old 27 February 2018, 18:16   #3
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Join Date: Feb 2018
Location: Brisbane Australia
Posts: 15

I like the simplicity of your tool and it comes in very handy.

I like this tool also, but only if I have a need to change the bitplanes or other parameters of custom icons.

Thanks for the tool and links, much appreciated.
trumpy81 is offline  
Old 27 February 2018, 19:29   #4
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Posts: 2,407
Originally Posted by trumpy81 View Post
@eva ...

@PeterK ...

Both would be lovely, but I'm already too old ...
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