DaemonFS is a tool that monitors in real time files on your hard disk.
May used for reverse engineering, software analysis, hard disk usage tracking and more.

You can watch every file by selecting single files or directories, with all their subfiles.
DaemonFS is free and open source.

Features:
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+ cross-platform Windows, Mac OS X, Linux
+ hidden files are also monitored
+ recursive file indexing
+ tray icon notifications
+ Simple and tiny