Couple more:

DBX, EMLX, EMAIL, MSG, SNM, MBX, NCH, ODS (Mail)
WAB, MAB, OST (Address book)
PPSM, PPTM, PRC, SHW (Presentation)
DOCM, DOCX (Word processing)
TAX (Tax return)
SEC, SKR (Private/secret keys)

And PTS in my previous post should be PST, sorry.