| O |
Object file (Unix) |
| O |
Object file (Atari) |
| O |
Object file (GCC) |
| OAS |
Word processor document (Fujitsu OAS)(Japanese) |
| OAZ |
Fax (NetFax Manager) |
| OB |
Object cut/paste file (IBM LinkWay) |
| OBD |
Binder template (Microsoft Office) |
| OBD |
Binder (Microsoft Office) |
| OBJ |
Object file |
| OBR |
Object browser data file (Borland C++) |
| OBS |
Script (ObjectScript) |
| OBV |
Visual interface (ObjectScript) |
| OBZ |
Binder Wizard (Microsoft Office) |
| OCF |
Object craft file (Object Craft) |
| OCR |
Transcribed fax-to-text file (FAXGrabber) |
| OLE |
Object Linking and Embedding (OLE) custom control (Microsoft) |
| ODL |
Type library source (Visual C++) |
| ODS |
Mailbox file (Microsoft Outlook Express) |
| OFD |
Form definition (ObjectView) |
| OFF |
Object File (3D Mesh) |
| OFN |
FileNew file (Microsoft Office) |
| OFT |
Template (Microsoft Outlook) |
| OKR |
Feldeinteilung module file (3-D Fassade Plus) |
| OKT |
Music module (MOD) (Oktalyzer) |
| OLB |
Object Library (OLE) (Microsoft) |
| OLB |
Object library (VAX) |
| OLD |
Backup file (Generic) |
| OLE |
OLE object |
| OLI |
Text file (Olivetti) |
| OO1 |
Voice file (Typhoon) |
| OOGL |
Object Oriented Graphics Library |
| OOM |
Swap file (Shroom) |
| OPJ |
Project file (Orcad Schematic Capture) |
| OPL |
Organiser Programming Language source file (Psion/Symbian) |
| OPN |
Active options (Exact) |
| OPO |
Output executable file (OPL) |
| OPT |
Developer Studio file (Microsoft) |
| OPT |
Optimize support file (QEMM) |
| OPW |
Organization chart (Org Plus for Windows) |
| OPX |
Extension DLL (OPL) |
| OPX |
Inactive options (Exact) |
| ORA |
Parameter file (Oracle) |
| ORC |
Script (Oracle 7) |
| ORG |
Calendar file (Lotus Organizer) |
| OR2 |
Calendar file (Lotus Organizer 2) |
| OR3 |
Lotus Organizer 97 file |
| ORA |
Configuration file (Oracle 7) |
| OSS |
Search file (Microsoft Office) |
| OST |
Offline file (Microsoft Exchange/Outlook) |
| OTL |
Outline font description (Z-Soft Type Foundry) |
| OTL |
Template file (Super NoteTab) (Fookes) |
| OTL |
Template file (PrintMaster Gold) |
| OTX |
Text file (Olivetti Olitext Plus) |
| OUT |
Output file (Microsoft C) |
| OV |
Database file (Revelation-DOS) |
| OV1 |
Overlay file |
| OV2 |
Overlay file |
| OVD |
Datafile (ObjectVision) |
| OVL |
Overlay file |
| OVR |
Overlay file |
| O$$ |
Outfile (Sprint) |
