When I use virtual dyno, here is how I like to do things.
1. Go get a good 3rd gear pull on a very flat road that is straight.
2. Save the log as a .TCL
3. Open to .TCL
4. Save log as a .CSV
5. Nismotronic will prompt you to open log with virtual dyno
6. Click yes
7. You have successfully loaded a log into virtual dyno
If you need instructions on how to use virtual dyno, just let me know.