| O |
Object
file (Unix) |
| OBD |
Binder
template (Microsoft Office) |
| OBD |
Binder
(Microsoft Office) |
| OBJ |
Object
file |
| OBR |
Object
browser data file (Borland C++) |
| OBZ |
Binder
Wizard (Microsoft Office) |
| ODL |
Type
library source (Visual C++) |
| ODS |
Mailbox
file (Microsoft Outlook Express) |
| OFN |
File
New file (Microsoft Office) |
| OFT |
Template
(Microsoft Outlook) |
| OLB |
Object
Library (OLE) (Microsoft) |
| OLD |
Back
up file |
| OLE |
Object
Linking and Embedding (OLE) custom
control (Microsoft) |
| OOGL |
Object
Oriented Graphics Library |
| OPT |
Developer
Studio file (Microsoft) |
| OPX |
MS
Organization Chart 2.0 |
| ORG |
Calendar
file (Lotus Organizer) |
| OR2 |
Calendar
file (Lotus Organizer 2) |
| OR3 |
Lotus
Organizer 97 file |
| OSS |
Search
file (Microsoft Office) |
| OST |
Offline
file (Microsoft Exchange/Outlook) |
| OTL |
Template
file (Print Master Gold) |
| OUT |
Output
file (Microsoft C) |
| OVR |
Overlay
file |
