I decided to see what had accumulated in the TEMP folder on my XP machine, and noticed a lot of subdirectories with 2 files in each.
A bit of experimenting showed that everytime I used Studio6.1 beta to program a chip with my JtagMkIII there would be 8 subdirectories and a total of 1.5Mbytes of files created.
Those 'temporary' files were not cleaned-up after Studio6.1 beta exited, or when XP was restarted.
The files seem to be multiple copies of the firmware for the JtagMkIII programmer.
Studio32 did a similar thing, but it only did it once on startup, not 8 times !
Anyone else noticed this ?