| oakley.dll | Hanterare for Oakley-nycklar | 561 |
| oart.dll | Microsoft OfficeArt | 3559 |
| objc.dll | Objective-C Runtime Library | 3310 |
| Object.dll | N/A | 2640 |
| objsel.dll | Dialogrutan Valj objekt | 4052 |
| obs.dll | N/A | 2786 |
| oc25.dll | N/A | 694 |
| occache.dll | Object Control Viewer | 4674 |
| ocevogyv.dll | Host Library | 4829 |
| OCI.DLL | Oracle Call Interface | 2885 |
| ocmanage.dll | Bibliotek for hanteraren av valfria komponenter | 4564 |
| ocsetapi.dll | Windows Optional Component Setup API | 768 |
| oda_dll.dll | TODO: | 3761 |
| odbc16gt.dll | N/A | 2240 |
| ODBC32.DLL | Microsoft ODBC Driver Manager | 1898 |
| odbc32gt.dll | ODBC Driver Generic Thunk | 1351 |
| odbcbcp.dll | BCP for ODBC | 2936 |
| odbcconf.dll | ODBC Driver Configuration Program | 1636 |
| odbccp32.dll | ODBC Installer | 3067 |
| odbccr32.dll | ODBC Cursor Library | 2474 |
| odbccu32.dll | ODBC Cursor Library | 2086 |
| odbcint.dll | ODBC Resources | 1066 |
| odbcji32.dll | Microsoft ODBC Desktop Driver Pack 3.5 | 1530 |
| odbcjt32.dll | Microsoft ODBC Desktop Driver Pack 3.5 | 4842 |
| odbcp32r.dll | Microsoft Data Access - ODBC Driver Manager Resources | 3140 |
| odbctrac.dll | ODBC Driver Manager Trace | 3801 |
| oddbse32.dll | ODBC (3.0) driver for DBase | 653 |
| ode.dll | ODE Single Precision DLL for DelphiODE | 3394 |
| odexl32.dll | ODBC (3.0) driver for Excel | 3919 |
| odfox32.dll | ODBC (3.0) driver for FoxPro | 3220 |
| odpdx32.dll | ODBC (3.0) driver for Paradox | 1347 |
| odtext32.dll | ODBC (3.0) driver for text files | 4634 |
| OEMHelpIns.dll | Microsoft® Help Customization Installer | 611 |
| oemlicense.dll | Client Licensing Platform Client Provisioning | 3647 |
| OFCommon.dll | Advanced SystemCare 7 Library | 3858 |
| offfilt.dll | OFFICE Filter | 1956 |
| offreg.dll | Offline registry DLL | 1830 |
| ogg_vs2010_x86_rwdi.dll | N/A | 1102 |
| ogg.dll | N/A | 2872 |
| ogldrv.dll | MSOGL | 3638 |
| OgreAL.dll | N/A | 1841 |
| OgreMain.dll | N/A | 1635 |
| OgreTerrain.dll | N/A | 3874 |
| OIFIL400.DLL | FILING LIBRARY | 3364 |
| OK9IBRES.DLL | OKI9IBM | 715 |
| OKDTERES.DLL | OKI MICROLINE | 532 |
| OKDTURES.DLL | OKI MICROLINE | 1398 |
| OKESCPU.DLL | OKI MICROLINE Printer Driver | 3975 |
| olch2d32.dll | Olectra Chart 2D Control for 32-bit Windows | 4731 |
| ole2.dll | N/A | 4586 |
| ole2disp.dll | N/A | 522 |
| ole2nls.dll | N/A | 1592 |
| ole32.dll | Microsoft OLE for Windows | 2184 |
| oleacc.dll | Active Accessibility Core Component | 3991 |
| oleacchooks.dll | Active Accessibility Event Hooks Library | 2890 |
| oleaccrc.dll | Active Accessibility Resource DLL | 4071 |
| oleaut32.dll | N/A | 1485 |
| olecli.dll | N/A | 2184 |
| olecli32.dll | Object Linking and Embedding Client Library | 2996 |
| olecnv32.dll | Microsoft OLE for Windows | 1913 |
| oledlg.dll | OLE User Interface Support | 3054 |
| oleprn.dll | Oleprn DLL | 2370 |
| olepro32.dll | N/A | 2689 |
| oleres.dll | Ole resource dll | 3631 |
| olesvr.dll | N/A | 1121 |
| olesvr32.dll | Object Linking and Embedding Server Library | 1212 |
| olethk32.dll | Microsoft OLE for Windows | 2069 |
| OLMAPI32.DLL | Extended MAPI 1.0 for Windows NT | 2525 |
| OmdProject.dll | Windows DVD Maker | 2531 |
| ONCoreFoundation8.dll | ONCoreFoundation | 2305 |
| OnDemandConnRouteHelper.dll | On Demand Connctiond Route Helper | 868 |
| onex.dll | IEEE 802.1X supplicant library | 1593 |
| onexui.dll | IEEE 802.1X supplicant UI library | 4718 |
| onlineclient.dll | Backup Now EZ Module | 3498 |
| OnLineIDCpl.dll | Online IDs Control Panel | 731 |
| Ontology.dll | Application Ontology library | 2979 |
| oo2core_4_win64.dll | N/A | 3362 |
| OobeFldr.dll | Getting Started | 2256 |
| Op14Codec.dll | GeoVision(R) Codec | 2481 |
| OPCLib.DLL | OPCLib | 4649 |
| OpcServices.dll | Native Code OPC Services Library | 1661 |
| OpenAL32.dll | Standard OpenAL(TM) Implementation | 6854 |
| OpenCL.dll | OpenCL Client DLL | 1747 |
| OpenColorIO.dll | N/A | 3236 |
| opencv_core220.dll | N/A | 2193 |
| OpenGL.dll | HFX OpenGL Rendering Engine | 1934 |
| opengl32.dll | OpenGL Client DLL | 3566 |
| openldap.dll | N/A | 1215 |
| optimfrog.dll | N/A | 1571 |
| optix.1.dll | NVIDIA OptiX Ray Tracing Engine | 1374 |
| optixu.1.dll | NVIDIA OptiX Ray Tracing Utility Library | 1283 |
| opus.dll | N/A | 2986 |
| ortp.dll | N/A | 2092 |
| osbaseln.dll | Service Reporting API | 2027 |
| osblprov.dll | Service Reporting WMI Provider | 3383 |
| oscore.dll | Core Services DLL | 1819 |
| osetup.dll | Office Setup Engine | 521 |
| OskSupport.dll | Microsoft On-Screen Keyboard Support Utilities | 1894 |
| OSProvider.dll | DISM OS Services Provider | 1159 |
| ossim.dll | N/A | 1877 |
| osuninst.dll | Uninstall Interface | 4303 |
| otu.dll | GOTU Service Access Layer DLL | 1531 |
| OUTLLIB.DLL | Microsoft Outlook | 576 |
| ovtFBoot.dll | MSBootDll | 5005 |
