I cannot open a OCA file. What should I do? Help!

Virtually anyone has encountered some problems with opening unknown files while working on a computer. It can be very frustrating. Yet such problems, not only with OCA files, can be addressed in a standard way. Follow the steps below and we can guarantee that your problem with opening OCA will be resolved!

OCA File Extension

  • File type Custom Control Library Type Format
  • File developer Microsoft
  • File category Developer Files
  • File popularity rating
    • Star
    • Star
    • Star

How to open OCA file?

If given user account does not have necessary permissions to open files with OCA extension, it is highly probable that no program that supports given files is installed on the users’ system. Below is a list of actions user should pursue in order to resolve most common problems.

Step 1. Download and install application that supports OCA files

After the application has been installed, the system should automatically open OCA files with given application. Below is the list of relevant programs along with operating systems they are available for:

Programs that support OCA files

Step 2. Verify whether OCA files are associated with appropriate software

It is possible that an application that supports OCA files is not associated with such files. In such case, the program should by manually associated with OCA files (right-click on the file icon → PropertiesGeneral Tab → In submenu "Open with" and click on "Change" button. System will display a list of suggested programs that support OCA files. Choose the application by checking the box "Always use the selected application to open this kind of files". System will store this information in its registry and use it to open OCA files with the selected program.

Changing OCA file association in registry

File association for OCA files can be edited manually by editing appropriate entry in Windows System Registry. However, it is discouraged as it may introduce errors to registry if not done properly and may even damage the system.

Step 3. Check OCA file for other errors

  • OCA file was not copied properly from storage medium.
  • Antivirus application prevents opening OCA files. In that case it is recommended to exercise extreme caution and recover or delete infected OCA file. It is also advised to scan the entire system for malicious software and viruses with antivirus software.
  • For OCA files downloaded from the internet it is advised to check if the file has been downloaded completely and is not corrupted. If not, the file should be re-downloaded.

Similar file extensions