...these three directories:

Mk3\0103
Mk3\0107
Mk3\0116
Mk3\0127

All these apart from 0107 have OS software:
BMWC01S\ (colour OS)
BMWM01S\ (monochrome OS)

Who knows what the different directories mean (0103, 0107, etc) ??

The interesting thing is that the Mk3 splash logo is in the file usw_load:

Mk3\0103\BMWC01S\app_sw\usw_load

The usw_load is the same identical file in all of these directories:

Mk3\0103\BMWC01S\app_sw\
Mk3\0116\BMWC01S\app_sw\
Mk3\0127\BMWC01S\app_sw\

You can extract and replace the logo with GifExtractor, I have created new usw_load files with different images - ready to try

But first attempt looked like it crashed the SW load process on my Mk3, I was scared I had broken the Mk3 - but I managed to get to boot up again with an oriignal OS disk

Anybody else had a go at this?

Jochen