You're lucky,
Drapes - I tend to only get
arse achingly dull business presentations
As
LH2 has quite correctly pointed out, PPS files are increasingly becoming the vehicle for some rather nasty viruses/ malware/ spyware.
A particularly nasty one masquerades as a "funny Star Trek clip".
Do NOT open this - Bin it & delete it. It will infect virtually every file it can on your PC, and then it steals your passwords.
Don