How to find free programs to open unknown file formats?

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5 is a simple program that integrates with Windows context menu. Its primary purpose is to find programs that can open files with unknown extensions. If you ever choppy on file with unknown extension that you want to open, this program will find a solution.

All you need to do is click the right mouse button on the mystery file and select the command ”How do I open this?” will be open and offer links to download free program that can open a file with unknown extension.

List of supported file types is huge, and includes archives, images, documents, audio files, disk images, and much more. A full list can be found on the

This service is an excellent solution for those situations when you just want to know what is and for what purpose are .xspf, .xxe, etc… extension. is a free program and only works in 32-bit Windows systems.

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