There is nothing special in opening a file, but there are several ways to open a file which could be interesting.
Normal opening via the menu is probably the best known way.
This method follows the Opening Stategy.
Ctrl + O
Since opening a file is very often needed, the tool bar includes a folder button to do this.
The opened files will be available at File | Open recent files.
You can start SPHW LogViewer with the path or paths as arguments like this:
LogViewer.exe "path/to/file1.log" "path/to/file2.log" ...
SPHW LogViewer is opening all of these files in separate tabs.
The path as arguments is also what enables you to open a file with the "open with" method, or you associate a file ending directly with the SPHW LogViewer.
On the very first opening, the open dialog will show the default system location. After the first opening the path will change related to the following rules.