Creating app which opens a custom file extension

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Want to create an android application, which opens a custom-build file extension (for example, I want to open .abcd files)

It is something like Adobe Reader that opens .pdf files, or Photo Viewer that opens .jpg files

Specific conditions:
1. The .abcd file should be outside / external from the application itself. (as .pdf is to Adobe Reader)
2. The .abcd file would be a zipped file, which contains few folders and .xml, .txt, and .jpg files. I think I want to extract it – maybe temporarily – to somewhere in the storage (definitely need a zipper/unzipper library), then read the individual .xml, .txt, and .jpg files.

Looking for insights and answers for this problem.

Additional information:
I am relatively new to Android programming.

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