oops, i didn't have room for the link:
but... yeah. as far as i know, files are cross-compatible between windows and RISC OS versions... although there's no linux version, which is unfortunate (but the source is provided, for anyone who fancies a go at it - maybe winelibs would help?)
now i just need to persuade myself that i can justify the cost of a PiTop, so i can have a RISC OS lappy. i could emulate it on the Alleged Laptop, but it's just not the same...
btw, Fireworkz' current memory usage on my RISC OS box, while editing a 50 page document: 2016KB. it was 2048KB a moment ago, but it seems to have freed up 32KB in the meantime.