I am quite fond of troubleshooting tools and usually have a lot of opportunities to use those. ProcessActivityView is sister utility to OpenedFilesView and unlike latter (or overpowered Process Monitor) is made to trace file activity of single process.
What it does
On launch app prompts to choose currently running process and starts to monitor its file activity.
Interface is typical for Nirsoft software – minimalistic and with numerous columns that can be toggled and used for sorting.
App adds index by order of files accessed so is very good for detecting specific patterns of files used together.
Narrow focus allows software to be extremely efficient. Processor overhead is very low and prolonged usage doesn’t consume excessive memory.
Simple, efficient, works without installation and perfect for anything from tracing those elusive profile-specific application settings to virus activity.