| .otm |
Outlook Macro File |
| .oss |
Microsoft Outlook Saved Search File |
| .onetoc2 |
Microsoft OneNote Table of Contents File |
| .officeui |
Microsoft Office UI Customization File |
| .oms |
HP Printer Substrate Presets Package File |
| .otpu |
Origin Unicode Graph Template |
| .oce |
Open Catalog Extension Connection File |
| .opts |
Linux Configuration Options File |
| .obt |
Openbox Theme File |
| .otz |
OpenLP Theme File |
| .otw |
Origin Workbook Template |
| .otwu |
Origin Unicode Workbook Template |
| .otmu |
Origin Unicode Matrix Template |
| .olk14pref |
Outlook Preferences File |
| .options |
SE-SOFT Configuration File |
| .onetoc |
Microsoft OneNote Table of Contents File |
| .ois |
Origin Analyses Theme File |
| .oif |
Origin Import Filter File |
| .ofp |
Origin Function Plot Theme File |
| .pkg |
Package File |
| .prf |
Outlook Profile File |
| .psp |
PaintShop Pro Image File |
| .plist |
Mac OS X Property List File |
| .prx |
PSP Plugin File |