Now you can, with help of Halo 3 CDE! (Halo 3 Container Detail Editor)
Halo 3 CDE will also allow you to add controller button icons into the description of your container file! (Credits to Luxurious Meat for the enums)
Screenshots:
Click the 'Button Enums' button to bring up this screen:
To add a button icon into the description is simple. You look for the button you want to put in on the screenshot above, and type in the 3 characters that correspond to the icon you want.
E.g if I wanted to put the 'Y' button icon in, i would type ';04' where I wanted the icon to appear. Nice and simple
Halo 3 CDE also has the ability to re-hash and re-sign, or if you don't want to, you can click 'Just save' and it won't re-hash or re-sign
Note: It will only work for Halo 3 usermaps, screenshots, gametypes and film clips. Nothing else.
You must have a KV.bin in the same directory as thye program or it will not re-sign anything, and you must keep the 'DevComponents.DotNetBar2.dll' in the same directory as the program or it won't load
H3 CDE should be attached to this post...
Have fun