It's called "Modified" file date for a reason. It's the last time the file was modified. That can be important. Just opening the file and closing it again is NOT modifying it. No other software behaves this way.
I'm just noticing that UniLogic is changing the "Modified" file date on the .ulpr file when the file is opened, even if the file was not changed or saved. I've never noticed this before so maybe it's new to 1.29.111. This is BAD! Unitronics needs to fix this problem immediately. If the file was not modified it has no business changing that date. Perhaps I'm missing something - anyone else see this behavior with 1.29.111?