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File Extensions

Browse file extensions by category or letter. Learn what each file type is used for and find software that can open, view, edit, or convert it.

4
Indexed file extensions

Find the right information for any file extension

Use this directory to look up file formats, understand what files are used for, and find compatible applications for Windows, macOS, Linux, mobile, and online tools.

Search by extension Enter extensions like PDF, APK, DAT, HEIC, ZIP, or DOCX.
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4 extensions
Executable Letter: O Clear all
.OCX

OLE Control Extension 4

An OLE Control Extension (OCX) file is a type of dynamic-link library (DLL) used in Microsoft Windows operating systems. OCX files con…

Executable
.OCX (OLE CONTROL EXTENSION - OLDER WINDOWS TECHNOL

OLE Control Extension

An OCX file is a type of file used in older versions of Microsoft Windows. The extension stands for OLE Control Extension. OCX files a…

Executable
.OCX (OLE CONTROL EXTENSION - OLDER WINDOWS TECHNOL

OLE Control Extension

OCX files are components used by Windows operating systems to provide reusable functionality to different software applications. They…

Executable
.OCX (OLE CONTROL EXTENSION - OLDER WINDOWS TECHNOL

OLE Control Extension

OCX files are components used in the Microsoft Windows operating system. They are essentially Dynamic Link Libraries (DLLs) that imple…

Executable

Frequently Asked Questions

Everything you need to know about file extensions

You can search by entering a file extension directly in the search bar or browse the directory by category or alphabetical index.

Each listing provides a definition of the file extension, common use cases, compatible software, supported platforms, and related or alternative formats.

The database is updated regularly to reflect new file extensions, changes in software compatibility, and evolving file format standards.