O
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
OFN Microsoft Office FileNew file
OFT Microsoft Outlook template
OKT Oktalyzer music module (MOD) file
OLB OLE Object Library
OLE OLE object
OPT Microsoft Developer Studio file
ORG Lotus Organiser file
OR2 Lotus Organiser 2 file
OR3 Lotus Organiser 97 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
OFN Microsoft Office FileNew file
OFT Microsoft Outlook template
OKT Oktalyzer music module (MOD) file
OLB OLE Object Library
OLE OLE object
OPT Microsoft Developer Studio file
ORG Lotus Organiser file
OR2 Lotus Organiser 2 file
OR3 Lotus Organiser 97 file
