This appears to be a fragment of a file name for a of OMSI 2: Steam Edition , specifically an update released on March 15, 2018.
OMSI 2: The Omnibus Simulator , a highly detailed bus simulator set in Berlin. OMSi.2.Steam.Edition.MULTi8.Update.15.03.2018.p...
The legitimate version is available on the Steam Store , which ensures you receive official updates and can easily install community mods. This appears to be a fragment of a