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jpg、gif、pngは関連付けダイアログが表示されますが、xlsxなどは問題なくアプリ 
が起動します。 
 
私のPC環境のレジストリ設定がダメな気がします。Win10をクリーンインストールを 
して、いくつかのアプリケーションをインストールした状態です。 
 
レジストリはこんな感じになっております。 
 
Windows Registry Editor Version 5.00 
 
[HKEY_CLASSES_ROOT\.jpg] 
@="jpegfile" 
"Content Type"="image/jpeg" 
"PerceivedType"="image" 
 
[HKEY_CLASSES_ROOT\.jpg\OpenWithList] 
 
[HKEY_CLASSES_ROOT\.jpg\OpenWithList\Illustrator.exe] 
@="" 
 
[HKEY_CLASSES_ROOT\.jpg\OpenWithList\PhotoshopElementsEditor.exe] 
 
[HKEY_CLASSES_ROOT\.jpg\OpenWithProgids] 
"AppX43hnxtbyyps62jhe9sqpdzxn1790zetc"=hex(0): 
"AppXvhc4p7vz4b485xfp46hhk3fq3grkdgjg"=hex(0): 
"jpegfile"="" 
 
[HKEY_CLASSES_ROOT\.jpg\PersistentHandler] 
@="{098f2470-bae0-11cd-b579-08002b30bfeb}" 
 
もうひとつ、 
 
Windows Registry Editor Version 5.00 
 
[HKEY_CLASSES_ROOT\jpegfile] 
@="JPEG Image" 
"EditFlags"=dword:00210000 
"FriendlyTypeName"=hex(2):40,00,25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,\ 
  00,6f,00,6f,00,74,00,25,00,5c,00,53,00,79,00,73,00,74,00,65,00,6d,00,33,00,\ 
  32,00,5c,00,73,00,68,00,65,00,6c,00,6c,00,33,00,32,00,2e,00,64,00,6c,00,6c,\ 
  00,2c,00,2d,00,33,00,30,00,35,00,39,00,36,00,00,00 
"ImageOptionFlags"=dword:00000001 
 
[HKEY_CLASSES_ROOT\jpegfile\CLSID] 
@="{25336920-03F9-11cf-8FD0-00AA00686F13}" 
 
[HKEY_CLASSES_ROOT\jpegfile\DefaultIcon] 
@=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,\ 
  00,5c,00,53,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,69,00,6d,00,\ 
  61,00,67,00,65,00,72,00,65,00,73,00,2e,00,64,00,6c,00,6c,00,2c,00,2d,00,37,\ 
  00,32,00,00,00 
 
[HKEY_CLASSES_ROOT\jpegfile\shell] 
 
[HKEY_CLASSES_ROOT\jpegfile\shell\printto] 
"NeverDefault"="" 
 
[HKEY_CLASSES_ROOT\jpegfile\shell\printto\command] 
@=hex(2):22,00,25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,\ 
  00,25,00,5c,00,53,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,72,00,\ 
  75,00,6e,00,64,00,6c,00,6c,00,33,00,32,00,2e,00,65,00,78,00,65,00,22,00,20,\ 
  00,22,00,25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,\ 
  25,00,5c,00,53,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,73,00,68,\ 
  00,69,00,6d,00,67,00,76,00,77,00,2e,00,64,00,6c,00,6c,00,22,00,2c,00,49,00,\ 
  6d,00,61,00,67,00,65,00,56,00,69,00,65,00,77,00,5f,00,50,00,72,00,69,00,6e,\ 
  00,74,00,54,00,6f,00,20,00,2f,00,70,00,74,00,20,00,22,00,25,00,31,00,22,00,\ 
  20,00,22,00,25,00,32,00,22,00,20,00,22,00,25,00,33,00,22,00,20,00,22,00,25,\ 
  00,34,00,22,00,00,00 
 
[HKEY_CLASSES_ROOT\jpegfile\ShellEx] 
 
[HKEY_CLASSES_ROOT\jpegfile\ShellEx\{e357fccd-a995-4576-b01f-234630154e96}] 
@="{C7657C4A-9F68-40fa-A4DF-96BC08EB3551}" 
 
よろしくお願いいたします。 
 
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