Notes about the OTC file extension:
To open this file type, a required software must be installed. Without it you only see a Windows message "The following file cannot be opened
" (Windows 7) or "How do you want to open this file?
" (Windows 10) if you double-click the file. There click on "More apps"
and choose a suitable software to view such files on your PC or from email attachments.
The OTC file type is primarily associated with 'OpenOffice/StarOffice' by Sun Microsystems, Inc.. This file format is part of the Open Document Format for Office Applications (OpenDocument) 1.0 specification. This OASIS format is expected to become an industry standard for sharing documents. It is being adopted by the OpenOffice/StarOffice version 2 software suite but may appear in other products as well.
Detailed information for file extension OTC:
File classification: XML
Mime type: application/vnd.oasis.opendocument.chart-template, application/x-vnd.oasis.opendocument.chart-template
To change file associations press Windows Key
and then Apps and Features
> Default apps
> Choose default apps by file type
Invalid file associations could be the result of underlying issues within your Windows PC.