[A][B][C][D][E][F][G][H][I][J][K][L][M][N][O][P][Q][R][S][T][U][V][W][XYZ]

O
O01
Typhoon voice file
OBD
Microsoft Office binder template
OBD
Microsoft Office Binder
OBJ
Object file
OBZ
Microsoft Office Binder Wizard
OCX
Microsoft Object Linking and Embedding custom control
ODS
Microsoft Outlook Express mailbox file (?)
OFF
3D mesh Object File Format
OFN
Microsoft Office FileNew file
OFT
Microsoft Outlook template
OKT
Oktalyzer music module (MOD) file
OLB
OLE Object Library
OLE
OLE object
OOGL
Object Oriented Graphics Library
OPL
Organiser Programming Language source file - Psion/Symbian
OPO
OPL output executable file
OPT
Microsoft Developer Studio file
OPX
OPL extension DLL
ORC
Oracle 7 script
ORG
Lotus Organiser file
OR2
Lotus Organiser 2 file
OR3
Lotus Organiser 97 file
ORA
Oracle 7 configuration
OSS
Microsoft Office Search file
OST
Microsoft Exchange/Outlook Offline file
OTL
Super NoteTab template file (Fookes)

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