Known OCA Files

Leading OCA Type

.OCA

File Ext:	.oca
Type:	Custom Control Library Type File

Library type file created automatically by Visual Basic for every custom control file (.OCX files). OCA file contains standard descriptions of objects, properties, and methods used by OLE Automation.

Author:	Microsoft Corporation
Division:	Developer Files
Folder:	HKEY_CLASSES_ROOT\.oca

Software Programs That Open The Custom Control Library Type File:

Microsoft Visual Basic by Microsoft Corporation

Windows

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Troubleshooting Problems Opening OCA Files

Troubles Opening OCA Files

Microsoft Visual Basic Isn't There

Double-clicking your OCA file prompts the message "%%os%% Can't Open OCA File". Customarily, this means that Microsoft Visual Basic is not installed on %%os%%. This will prevent you from double-clicking to open the OCA file because the OS doesn’t know how to handle it.

Tip: If you know of another program that can open your OCA file, you can try opening it by selecting the application from the programs listed.

Microsoft Visual Basic Requires Update

It is possible that your version of Microsoft Visual Basic isn't able to open your Custom Control Library Type File file due to incompatibility. Visit the Microsoft Corporation website to download (or purchase) the latest version of Microsoft Visual Basic. Your Custom Control Library Type File file was probably created by a newer release of Microsoft Visual Basic than what's currently installed your computer.

Tip: Find clues on the correct software version by right-clicking your OCA file and clicking "Properties".

Primarily, problems experienced when opening OCA files are due to having the incorrect version of Microsoft Visual Basic installed on your computer.

Other Causes of OCA File Opening Problems

Assuming you have the right Microsoft Visual Basic version installed, other problems can prevent you from opening OCA files. There can be other issues - unrelated to software - preventing you from opening OCA files. Problems unrelated to software:

• Corrupt Windows Registry file path references for OCA
• The OCA file description within the Windows Registry was removed
• Partial installation of Microsoft Visual Basic that did not fully complete
• Your OCA can't be loaded properly (file corruption)
• Past or present virus infection has affected your OCA
• Hardware associated with OCA has outdated drivers
• Your PC doesn’t have enough available resources to open the Custom Control Library Type File file