File extensions starting with O
- File extension ODT - Open ODT File
- File extension OGG - Open OGG File
- File extension OCX - Open OCX File
- File extension OFX - Open OFX File
- File extension ODS - Open ODS File
- File extension ORIG - Open ORIG File
- File extension OLD - Open OLD File
- File extension OUT - Open OUT File
- File extension ODG - Open ODG File
- File extension OPUS - Open OPUS File
- File extension OPDOWNLOAD - Open OPDOWNLOAD File
- File extension OXPS - Open OXPS File
- File extension OGV - Open OGV File
- File extension OBB - Open OBB File
- File extension ODM - Open ODM File
- File extension ODP - Open ODP File
- File extension OFM - Open OFM File
- File extension OPS - Open OPS File
- File extension OST - Open OST File
- File extension OFC - Open OFC File
- File extension OPT - Open OPT File
- File extension OPD - Open OPD File
- File extension OBJ - Open OBJ File
- File extension OMA - Open OMA File
- File extension OPML - Open OPML File
- File extension OOS - Open OOS File
- File extension ORG - Open ORG File
- File extension OEM - Open OEM File
- File extension ONE - Open ONE File
- File extension OBI - Open OBI File
- File extension OTS - Open OTS File
- File extension OLB - Open OLB File
- File extension OFT - Open OFT File
- File extension OV2 - Open OV2 File
- File extension OVE - Open OVE File
- File extension OGM - Open OGM File
- File extension OVL - Open OVL File
- File extension OIF - Open OIF File
- File extension ORA - Open ORA File
- File extension ODB - Open ODB File
- File extension OPF - Open OPF File
- File extension ORD - Open ORD File
- File extension OPX - Open OPX File
- File extension OWS - Open OWS File
- File extension OCA - Open OCA File
- File extension OAB - Open OAB File
- File extension OPJ - Open OPJ File
- File extension OBD - Open OBD File
- File extension ODF - Open ODF File
- File extension OMG - Open OMG File