====== Tweaking Icon Catalog icon's ======
Depending on the IRIX versions, and Nekoware installations (which contains bugs), you may have to tweak the Irix Icon Catalog icon's.
IRIX was way ahead of its time. It hads vector icons (fti files) and rules to apply these icons to different kind of files (rules ftr files).

For the system Icon Catalog:
  * Default icons (fti) are in /usr/lib/filetype/install/iconlib
  * Icon rules (ftr) are in /usr/lib/filetype/install

For Nekoware:
  * Icons are in /usr/lib/filetype/local/iconlib
  * Rules are in /usr/lib/filetype/local

Rules matches different criterias, mainly tags, or calling names.
In an ftr file, there are lines like:
<code>MATCH       (tag == 0x00010646) || glob("Mozilla"));</code>
On IRIX binaries can be tagged. To know the tag of a binary:
<code>
$ tag -q /var/netscape/mozilla/mozilla-bin
/var/netscape/mozilla/mozilla-bin is tagged with Octal: 014236267141  Decimal: 1652125281  Hex: 0x62796e61
</code>
If you want to set a tag:
<code>
# tag 0x00010646 /var/netscape/mozilla/mozilla-bin
</code>
On the contrary, glob rule is usefull to match the caller script.
For Icon Catalog, these scripts are in /usr/lib/desktop/iconcatalog/pages/C/Applications:
<code>
$ ls -alFh /usr/lib/desktop/iconcatalog/pages/C/Applications/
total 8
lrwxr-xr-x    1 root     sys           38b sept 22 18:19 Firefox -> ../../../../../../nekoware/bin/firefox*
lrwxr-xr-x    1 root     sys           39b sept 22 19:21 Firefox3 -> ../../../../../../nekoware/bin/firefox3*
lrwxr-xr-x    1 root     sys           31b sept 21 19:29 Fsn -> ../../../../../../local/bin/fsn*
lrwxr-xr-x    1 root     sys           33b sept 19 14:26 jot -> ../../../../../../../usr/sbin/jot*
lrwxr-xr-x    1 root     sys           40b sept 19 14:26 maker -> ../../../../../../../usr/frame/bin/maker
lrwxr-xr-x    1 root     sys           42b sept 19 14:26 MediaMail -> ../../../../../../../usr/bin/X11/MediaMail
lrwxr-xr-x    1 root     sys           49b sept 19 14:27 Mozilla -> ../../../../../../../var/netscape/mozilla/mozilla*
lrwxr-xr-x    1 root     sys           15b sept 19 14:53 nedit -> /usr/sbin/nedit*
lrwxr-xr-x    1 root     sys           38b sept 19 14:26 showcase -> ../../../../../../../usr/sbin/showcase
lrwxr-xr-x    1 root     sys           17b sept 19 14:55 soffice -> /usr/sbin/soffice*
lrwxr-xr-x    1 root     sys           38b sept 19 14:26 Wingz -> ../../../../../../../usr/bin/X11/Wingz
drwxr-xr-x    2 root     sys          150b oct   2 23:31 ./
drwxr-xr-x   15 root     sys          4,0K sept 22 21:15 ../
</code>
During the installation of my workstation, I encountered some things to tweak.
  * zsh from Nekoware beta is buggy, you must unquote the tag which isn't interpreted correctly.
  * On IRIX 6.5.30, Mozilla is called from scripts, so you should use the glob condition in the MATCH directive (like in the example above).

You should update the icon's database:
<code># cd /usr/lib/filetype && make -u</code>
Then log out / log in.