File extension
File type
Developer
File format
OBI
Outlook RSS Subscription File
Microsoft
XML
ORA
Oracle Database Configuration File
Oracle
Text
ORA
OpenRaster Image File
N/A
Binary
ORIG
Original File
N/A
Text and Binary
OSM
OpenStreetMap Map File
OpenStreetMap
XML
OSDX
Search Connector Description File
Microsoft
XML
OTRKEY
OnlineTvRecorder Encoded Video File
OnlineTvRecorder.com
Binary
OPDOWNLOAD
Opera Partially Downloaded File
Opera Software
Text and Binary
OBK
Backup File
O&O Software
N/A
OMG
Image File
O&O Software
N/A
OMG
OpenMG Audio File
Sony
N/A
OBML16
Opera Mini Saved Web Page
Opera Software
Binary
ODIN
Locky Ransomware Encrypted File
N/A
N/A
OPJU
Origin Unicode Project
OriginLab
N/A
ORI
Original File
N/A
N/A
OEB
Outlook Express Backup Wizard File
QSX
Binary
OEB
Open eBook File
IDPF
Binary
OLB
OLE Object Library
Microsoft
Binary
OLB
OrCAD Symbol Library File
Cadence Design Systems
Binary
OFT
Outlook File Template
Microsoft
N/A
OPS
Office Profile Settings File
Microsoft
N/A
OFF
Object File Format
N/A
Text
ODG
OpenDocument Graphic File
OASIS
Zip
ODF
OpenDocument Formula
Oracle
Zip