Based on our record, FileInfo.com should be more popular than File-Extensions.org. It has been mentiond 2 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
You can put the extension into this websites search field; it will provide information related to it, including how to open them. Source: almost 3 years ago
If you are unsure which application will open the extension you can search for the extension here and read the section titled "programs that open ... files". Source: over 3 years ago
File-extensions.org lists following files for .3 extension:. Source: about 2 years ago
FileProInfo - It's All About Files, Software, Online Tools - 100% Free
FILExt - Open, view and convert files online
GroupDocs - GroupDocs is a web-based service for online document sharing, collaboration and management.
Convertio - File Conversion in the Cloud
FilePreviews - Thumbnails and metadata for almost any kind of file
Groupdocs.app - A group of free document automation apps to view, parse, convert & compare popular file formats.