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открыл - Программы по умолчанию, но не смог разобраться. »

Да. Этой программы нет в списке. Нужно делать всё в ручную через реестр:

• Default Programs
• Application Registration

Или готовый рег-файл:

Скрытый текст

Код:

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\News\Opera M2\Protocols\news\shell\open]

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\News\Opera M2\Protocols\news\shell\open\command]
@="\"C:\\Program Files (x86)\\Opera Mail\\operamail.exe\" \"%1\""

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\News\Opera M2\Protocols\nntp]
@="Opera M2 (News) URL"
"EditFlags"=dword:00000002
"URL Protocol"=""
"FriendlyTypeName"="Opera M2 (News) URL"

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\News\Opera M2\Protocols\nntp\DefaultIcon]
@="C:\\Program Files (x86)\\Opera Mail\\operamail.exe,1"

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\News\Opera M2\Protocols\nntp\shell]

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\News\Opera M2\Protocols\nntp\shell\open]

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\News\Opera M2\Protocols\nntp\shell\open\command]
@="\"C:\\Program Files (x86)\\Opera Mail\\operamail.exe\" \"%1\""

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\News\Opera M2\Protocols\snews]
@="Opera M2 (News) URL"
"EditFlags"=dword:00000002
"URL Protocol"=""
"FriendlyTypeName"="Opera M2 (News) URL"

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\News\Opera M2\Protocols\snews\DefaultIcon]
@="C:\\Program Files (x86)\\Opera Mail\\operamail.exe,1"

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\News\Opera M2\Protocols\snews\shell]

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\News\Opera M2\Protocols\snews\shell\open]

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\News\Opera M2\Protocols\snews\shell\open\command]
@="\"C:\\Program Files (x86)\\Opera Mail\\operamail.exe\" \"%1\""

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\News\Opera M2\shell]

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\News\Opera M2\shell\open]

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\News\Opera M2\shell\open\command]
@="\"C:\\Program Files (x86)\\Opera Mail\\operamail.exe\" /Mail"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\OperaM2.Url.mailto]
@="Opera M2 URL"
"FriendlyTypeName"="Opera M2 URL"
"URL Protocol"=""
"EditFlags"=dword:00000002

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\OperaM2.Url.mailto\DefaultIcon]
@="C:\\Program Files (x86)\\Opera Mail\\operamail.exe,3"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\OperaM2.Url.mailto\shell]

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\OperaM2.Url.mailto\shell\open]

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\OperaM2.Url.mailto\shell\open\command]
@="\"C:\\Program Files (x86)\\Opera Mail\\operamail.exe\" \"%1\""

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\OperaM2.Url.news]
@="Opera M2 (News) URL"
"FriendlyTypeName"="Opera M2 (News) URL"
"URL Protocol"=""
"EditFlags"=dword:00000002

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\OperaM2.Url.news\DefaultIcon]
@="C:\\Program Files (x86)\\Opera Mail\\operamail.exe,3"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\OperaM2.Url.news\shell]

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\OperaM2.Url.news\shell\open]

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\OperaM2.Url.news\shell\open\command]
@="\"C:\\Program Files (x86)\\Opera Mail\\operamail.exe\" \"%1\""

[HKEY_CURRENT_USER\Software\Clients\Mail]
@="Opera M2"

[HKEY_CURRENT_USER\Software\Clients\News]
@="Opera M2"

[HKEY_CURRENT_USER\Software\Classes\OperaM2.Url.mailto]
@="Opera M2 URL"
"FriendlyTypeName"="Opera M2 URL"
"URL Protocol"=""
"EditFlags"=dword:00000002

[HKEY_CURRENT_USER\Software\Classes\OperaM2.Url.mailto\DefaultIcon]
@="C:\\Program Files (x86)\\Opera Mail\\operamail.exe,3"

[HKEY_CURRENT_USER\Software\Classes\OperaM2.Url.mailto\shell]

[HKEY_CURRENT_USER\Software\Classes\OperaM2.Url.mailto\shell\open]

[HKEY_CURRENT_USER\Software\Classes\OperaM2.Url.mailto\shell\open\command]
@="\"C:\\Program Files (x86)\\Opera Mail\\operamail.exe\" \"%1\""

[HKEY_CURRENT_USER\Software\Classes\OperaM2.Url.news]
@="Opera M2 (News) URL"
"FriendlyTypeName"="Opera M2 (News) URL"
"URL Protocol"=""
"EditFlags"=dword:00000002

[HKEY_CURRENT_USER\Software\Classes\OperaM2.Url.news\DefaultIcon]
@="C:\\Program Files (x86)\\Opera Mail\\operamail.exe,3"

[HKEY_CURRENT_USER\Software\Classes\OperaM2.Url.news\shell]

[HKEY_CURRENT_USER\Software\Classes\OperaM2.Url.news\shell\open]

[HKEY_CURRENT_USER\Software\Classes\OperaM2.Url.news\shell\open\command]
@="\"C:\\Program Files (x86)\\Opera Mail\\operamail.exe\" \"%1\""

[HKEY_CLASSES_ROOT\OperaM2.Url.mailto]
@="Opera M2 URL"
"EditFlags"=dword:00000002
"FriendlyTypeName"="Opera M2 URL"
"URL Protocol"=""

[HKEY_CLASSES_ROOT\OperaM2.Url.mailto\DefaultIcon]
@="C:\\Program Files (x86)\\Opera Mail\\operamail.exe,3"

[HKEY_CLASSES_ROOT\OperaM2.Url.mailto\shell]

[HKEY_CLASSES_ROOT\OperaM2.Url.mailto\shell\open]

[HKEY_CLASSES_ROOT\OperaM2.Url.mailto\shell\open\command]
@="\"C:\\Program Files (x86)\\Opera Mail\\operamail.exe\" \"%1\""

[HKEY_CLASSES_ROOT\OperaM2.Url.news]
@="Opera M2 (News) URL"
"EditFlags"=dword:00000002
"FriendlyTypeName"="Opera M2 (News) URL"
"URL Protocol"=""

[HKEY_CLASSES_ROOT\OperaM2.Url.news\DefaultIcon]
@="C:\\Program Files (x86)\\Opera Mail\\operamail.exe,3"

[HKEY_CLASSES_ROOT\OperaM2.Url.news\shell]

[HKEY_CLASSES_ROOT\OperaM2.Url.news\shell\open]

[HKEY_CLASSES_ROOT\OperaM2.Url.news\shell\open\command]
@="\"C:\\Program Files (x86)\\Opera Mail\\operamail.exe\" \"%1\""

[HKEY_LOCAL_MACHINE\SOFTWARE\RegisteredApplications]
"Opera M2"="Software\\Clients\\Mail\\Opera M2\\Capabilities"
"Opera M2 (News)"="Software\\Clients\\News\\Opera M2\\Capabilities"

В зависимости от версии вашего клиента и его расположения подредактируйте файл под себя.