When UIforETW is first launched it installs Windows Performance Toolkit which includes xperf.exe. The installer adds xperf.exe to the system path. However it will only be in the path for UIforETW on subsequent launches. So, any scripts that are launched by UIforETW on its first run will fail to find xperf.exe and will fail to run correctly.
randomascii
commented
5 years ago
When UIforETW is first launched it installs Windows Performance Toolkit which includes xperf.exe. The installer adds xperf.exe to the system path. However it will only be in the path for UIforETW on subsequent launches. So, any scripts that are launched by UIforETW on its first run will fail to find xperf.exe and will fail to run correctly.