Presumably the icons which appear on MS Office toolbars are stored as icons within a DLL somewhere, do you know where?

I am sorry, I do not know this. The toolbar icons can also be stored as bitmap resources or possibly even as .pngs. All depends on the developers.

You can find an entire "library" of .dlls containing most or all of the MS Office File Icons within the following path:

C : Program Files > Microsoft Office > OFFICE11

Another path containing a "treasure chest" of icons ... all contained under the same .dll is as follows:

C : Program Files > Microsoft Office > OFFICE11 >1033 > OUTLLIBR.DLL

HAPPY HUNTING !!! I hope this is of some help!?