Game freezes in videosequence

[muunleit]

Check: Penumbra Black Plague\redist\sounds\player and look for player_scare_low and player_heartbeat. These files maybe missing.

Yes, both aren't there and I've got no redist-directory, the sounds-directory is directly inside the maininstall-directory.
There are files with the same name but countet (e.g. player_scare_low1.ogg, player_scare_low2.ogg, player_scare_low3.ogg) and a *.snt with the same name (player_scare_low.snt). There aren't any files without extensions at all.

Where can I get them? Do I need them?
The *.snt seems to be some kind of config-files for the others.