This is a fully functional standalone module from View+ application (EPOC32 ER5 Psion).
It is the unique Psion util that enables you to create from the scratch the icon (AIF) file for any installed application, in case you lost the original icon or if you just want to replace it with any other icon of your liking. You can set the caption name, set if the icon will be visible from the "Extras" and also if the application will support the creation of new files. The only thing you need is your own created or chosen MBM file as a source.
The use of AIF Builder is pretty straightforward and could be seen from the next two screenshots.
Save File: Aif_Builder_ER5.zip