[wolkow70]

Даже еще в Windows 7 программа не отображается в списке программ по умолчанию.
Пришлось самому перепаковать установщик добавив дополнительные ключи реестра.
Вот кусок скрипта в NSIS коде:

WriteRegStr HKLM "SOFTWARE\Clients\Media\AIMP\Capabilities\FileAssociations" ".aac" "AIMP.aac"
WriteRegStr HKLM "SOFTWARE\Clients\Media\AIMP\Capabilities\FileAssociations" ".ac3" "AIMP.ac3"
WriteRegStr HKLM "SOFTWARE\Clients\Media\AIMP\Capabilities\FileAssociations" ".ape" "AIMP.ape"
WriteRegStr HKLM "SOFTWARE\Clients\Media\AIMP\Capabilities\FileAssociations" ".cda" "AIMP.cda"
WriteRegStr HKLM "SOFTWARE\Clients\Media\AIMP\Capabilities\FileAssociations" ".flac" "AIMP.flac"
WriteRegStr HKLM "SOFTWARE\Clients\Media\AIMP\Capabilities\FileAssociations" ".it" "AIMP.it"
WriteRegStr HKLM "SOFTWARE\Clients\Media\AIMP\Capabilities\FileAssociations" ".midi" "AIMP.midi"
WriteRegStr HKLM "SOFTWARE\Clients\Media\AIMP\Capabilities\FileAssociations" ".mo3" "AIMP.mo3"
WriteRegStr HKLM "SOFTWARE\Clients\Media\AIMP\Capabilities\FileAssociations" ".mod" "AIMP.mod"
WriteRegStr HKLM "SOFTWARE\Clients\Media\AIMP\Capabilities\FileAssociations" ".m4a" "AIMP.m4a"
WriteRegStr HKLM "SOFTWARE\Clients\Media\AIMP\Capabilities\FileAssociations" ".m4b" "AIMP.m4b"
WriteRegStr HKLM "SOFTWARE\Clients\Media\AIMP\Capabilities\FileAssociations" ".mp1" "AIMP.mp1"
WriteRegStr HKLM "SOFTWARE\Clients\Media\AIMP\Capabilities\FileAssociations" ".mp2" "AIMP.mp2"
WriteRegStr HKLM "SOFTWARE\Clients\Media\AIMP\Capabilities\FileAssociations" ".mp3" "AIMP.mp3"
WriteRegStr HKLM "SOFTWARE\Clients\Media\AIMP\Capabilities\FileAssociations" ".mpc" "AIMP.mpc"
WriteRegStr HKLM "SOFTWARE\Clients\Media\AIMP\Capabilities\FileAssociations" ".mtm" "AIMP.mtm"
WriteRegStr HKLM "SOFTWARE\Clients\Media\AIMP\Capabilities\FileAssociations" ".ofr" "AIMP.ofr"
WriteRegStr HKLM "SOFTWARE\Clients\Media\AIMP\Capabilities\FileAssociations" ".ogg" "AIMP.ogg"
WriteRegStr HKLM "SOFTWARE\Clients\Media\AIMP\Capabilities\FileAssociations" ".rmi" "AIMP.rmi"
WriteRegStr HKLM "SOFTWARE\Clients\Media\AIMP\Capabilities\FileAssociations" ".s3m" "AIMP.s3m"
WriteRegStr HKLM "SOFTWARE\Clients\Media\AIMP\Capabilities\FileAssociations" ".spx" "AIMP.spx"
WriteRegStr HKLM "SOFTWARE\Clients\Media\AIMP\Capabilities\FileAssociations" ".tak" "AIMP.tak"
WriteRegStr HKLM "SOFTWARE\Clients\Media\AIMP\Capabilities\FileAssociations" ".tta" "AIMP.tta"
WriteRegStr HKLM "SOFTWARE\Clients\Media\AIMP\Capabilities\FileAssociations" ".umx" "AIMP.umx"
WriteRegStr HKLM "SOFTWARE\Clients\Media\AIMP\Capabilities\FileAssociations" ".wav" "AIMP.wav"
WriteRegStr HKLM "SOFTWARE\Clients\Media\AIMP\Capabilities\FileAssociations" ".wma" "AIMP.wma"
WriteRegStr HKLM "SOFTWARE\Clients\Media\AIMP\Capabilities\FileAssociations" ".wv" "AIMP.wv"
WriteRegStr HKLM "SOFTWARE\Clients\Media\AIMP\Capabilities\FileAssociations" ".xm" "AIMP.xm"

Вызывает недоумение, что такой пустяк несколько лет не могут или не хотят сделать.