I have found this solution:
https://forums.opensuse.org/showthread.php/517401-one-click-install-on-opera
works fine, but it should be narive to opera, not an option from chrome browser :(.
Posts made by jbresus
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Opera for LinuxRE: ymp files for opensuse
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Opera for LinuxRE: ymp files for opensuse
It has been 2 years since this post and nothing has been done. Anyone ? Why opera is ignoring this? Does someone solve this problem?
- Opera for Windows
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Opera for WindowsRE: Enable VPN (coming soon) -not available :(
STABLE - 37. You right
I though they already make it available 
- Opera for Windows
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Opera for Linuxymp files for opensuse
All of opensuse users know, that *.ymp files are for 1-click installations. They should not be opened as a txt file, instead - "open with" or "save as". This problem appears from the first version of new brand of opera, and never been fixed.
Try to open this file:
https://software.opensuse.org/package/opera?search_term=operaUnder Windows or Linux - the same behaviour. This is son annoying - I have to use another browser to install software in this way :(.