How to reduce windows app niceness?

[Circlotron]

I use a chip programmer connected to the serial port and at 115kbps it throws an error occasionally but at 19.2k it seems alright. I suspect it is sensitive to the priority of other running applications. I tried to reduce it's niceness but it wouldn't let me. For the sake of experiment how should I do this?

[dimesio]

Setting a negative niceness requires root privileges, and you shouldn't be running Wine as root. You can start the app as a normal user, then use renice (with sudo or su -, depending on your distro) to change the priority of the running process.