Opening an OPC File

The OPC file type is primarily associated with Microsoft Office.

OPC	File extension: OPC
	File type:	container file

What is an OPC file

OPC files mostly belong to Microsoft Office. OPC files are files based on the Open Packaging Convention standard.
They use a ZIP container format to bundle multiple files, XML parts, and relationship metadata together.
This approach lets software group document content, metadata, and even digital signatures into one package.

Used by Microsoft Office for documents like DOCX, XLSX, and PPTX

Employed in the Visual Studio ClickOnce Installer for application deployment

Can be examined with ZIP archive tools to see the internal structure

Opening an OPC file is best done with its native application, such as Microsoft Office, but advanced users can use an archive manager to inspect its components.
FilExt.com tip: For more info, visit Microsoft Office.

How to open an OPC file

You need a suitable software like Microsoft Office to open an OPC file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your OPC file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a OPC file directly in the browser:. Just drag the file onto this browser window and drop it.

Online OPC Text Viewer

Choose your .opc file to analyze

or drag and drop it here

Online File Viewer

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OPC file extension format:

The file format, which is the arrangement and type of data in a file, determines which program can open the file. Each file format has a unique extension and almost always a unique signature. For example, Microsoft Word documents have the extension .docx and the signature (usually the first 3 characters in this file) PK. Nonetheless, different programs can utilize the same file extension to represent distinct file formats. Double-clicking on the file often results in an error when opening. So a detailed analysis of a file is vital in order to determine the format and the associated program. Below you will find our evaluation of the OPC files:

OPC is not a commonly used file extension and is mainly used by one program with a specific format. But the following two file formats are common:

• 85% of all OPC files use the ZIP format, so several files are combined and compressed into one OPC file. An OPC file contains 125 to 140 files, the average being 139. File names inside are always [Content_Types].xml. A little tip: If you rename the file extension to .zip and then double-click, you will see the included files and images. The files are often between 23 MB and 74 MB in size. Certain words are almost always found in the files, such as _rels/.rels. Examples of file names are vs_installer.opc. Such files sometimes refer to installer.
• 1% of all OPC files are associated with Office Upgrade Control files, which internally utilize the well-known config format. A configuration file is used by computer software to store settings. It consists of a text-based content with a structure and syntax comprising key–value pairs for properties, and sections that organize the properties. These files are text files and can therefore be read using a text editor. OPC files are between 130 bytes and 490 KB in size.

All other OPC files (14%) have no uniform format. If you want to find out which format your OPC file belongs to, just click on the button "Choose your .opc file to analyze".