Ask for help and post your question on how to use XnView Classic.
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It may depend on the Windows 10 version, and is possibly becoming more difficult!
In general, an online search is a good first approach to Windows questions, here is one result from a quick search:
Change default programs in Windows 10
Whether that will work for you I don't know, if not a search including the version of Windows you currently have installed might produce a useful result.