Yes, that is all those files do....
You can actually open these files in notepad---they are just text files with a REG extension.
What Doug did was take all the settings that affect jpegs and create a file that can be used to reset the OS to the defaults
the file looks like :
Windows Registry Editor Version 5.00
[HKEY_CLASSES_ROOT\.jpe]
"PerceivedType"="image"
@="jpegfile"
"Content Type"="image/jpeg"
[HKEY_CLASSES_ROOT\.jpe\OpenWithProgids]
"jpegfile"=hex(0):
[HKEY_CLASSES_ROOT\.jpe\PersistentHandler]
@="{098f2470-bae0-11cd-b579-08002b30bfeb}"
[HKEY_CLASSES_ROOT\.jpeg]
"PerceivedType"="image"
@="jpegfile"
"Content Type"="image/jpeg"
[HKEY_CLASSES_ROOT\.jpeg\jpegfile]
[HKEY_CLASSES_ROOT\.jpeg\jpegfile\ShellNew]
[HKEY_CLASSES_ROOT\.jpeg\OpenWithProgids]
"jpegfile"=hex(0):
[HKEY_CLASSES_ROOT\.jpeg\PersistentHandler]
@="{098f2470-bae0-11cd-b579-08002b30bfeb}"
[HKEY_CLASSES_ROOT\.jpg]
"PerceivedType"="image"
@="jpegfile"
"Content Type"="image/jpeg"
[HKEY_CLASSES_ROOT\.jpg\jpegfile]
[HKEY_CLASSES_ROOT\.jpg\jpegfile\ShellNew]
[HKEY_CLASSES_ROOT\.jpg\OpenWithProgids]
"jpegfile"=hex(0):
[HKEY_CLASSES_ROOT\.jpg\PersistentHandler]
@="{098f2470-bae0-11cd-b579-08002b30bfeb}"
[HKEY_CLASSES_ROOT\jpegfile]
@="JPEG Image"
"EditFlags"=dword:00010000
"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,00,73,00,68,00,69,00,6d,00,67,00,76,00,77,00,2e,00,64,00,6c,00,6c,\
00,2c,00,2d,00,33,00,30,00,33,00,00,00
"ImageOptionFlags"=dword:00000003
[HKEY_CLASSES_ROOT\jpegfile\CLSID]
@="{11943940-36DE-11CF-953E-00C0A84029E9}"
[HKEY_CLASSES_ROOT\jpegfile\DefaultIcon]
@="C:\\WINDOWS\\Installer\\{90280409-6000-11D3-8CFE-0050048383C9}\\PEicons.exe,5"
[HKEY_CLASSES_ROOT\jpegfile\shell]
[HKEY_CLASSES_ROOT\jpegfile\shell\Open]
@="&Open"
[HKEY_CLASSES_ROOT\jpegfile\shell\Open\command]
@="\"C:\\Program Files\\Common Files\\Microsoft Shared\\PhotoEd\\PHOTOED.EXE\" \"%1\""
"command"=hex(7):43,00,38,00,34,00,44,00,56,00,6e,00,2d,00,7d,00,66,00,28,00,\
59,00,52,00,5d,00,65,00,41,00,52,00,36,00,2e,00,6a,00,69,00,50,00,68,00,6f,\
00,74,00,6f,00,45,00,64,00,69,00,74,00,6f,00,72,00,46,00,69,00,6c,00,65,00,\
73,00,3e,00,44,00,6f,00,54,00,5d,00,6a,00,49,00,7b,00,6a,00,66,00,28,00,3d,\
00,31,00,26,00,4c,00,5b,00,2d,00,38,00,31,00,2d,00,5d,00,20,00,22,00,25,00,\
31,00,22,00,00,00,00,00
[HKEY_CLASSES_ROOT\jpegfile\shell\Print]
@="&Print"
[HKEY_CLASSES_ROOT\jpegfile\shell\Print\command]
@="\"C:\\Program Files\\Common Files\\Microsoft Shared\\PhotoEd\\PHOTOED.EXE\" /p \"%1\""
"command"=hex(7):43,00,38,00,34,00,44,00,56,00,6e,00,2d,00,7d,00,66,00,28,00,\
59,00,52,00,5d,00,65,00,41,00,52,00,36,00,2e,00,6a,00,69,00,50,00,68,00,6f,\
00,74,00,6f,00,45,00,64,00,69,00,74,00,6f,00,72,00,46,00,69,00,6c,00,65,00,\
73,00,3e,00,44,00,6f,00,54,00,5d,00,6a,00,49,00,7b,00,6a,00,66,00,28,00,3d,\
00,31,00,26,00,4c,00,5b,00,2d,00,38,00,31,00,2d,00,5d,00,20,00,2f,00,70,00,\
20,00,22,00,25,00,31,00,22,00,00,00,00,00
[HKEY_CLASSES_ROOT\jpegfile\shell\Printto]
[HKEY_CLASSES_ROOT\jpegfile\shell\Printto\command]
@="\"C:\\Program Files\\Common Files\\Microsoft Shared\\PhotoEd\\PHOTOED.EXE\" /pt \"%1\" \"%2\" \"%3\" \"%4\""
"command"=hex(7):43,00,38,00,34,00,44,00,56,00,6e,00,2d,00,7d,00,66,00,28,00,\
59,00,52,00,5d,00,65,00,41,00,52,00,36,00,2e,00,6a,00,69,00,50,00,68,00,6f,\
00,74,00,6f,00,45,00,64,00,69,00,74,00,6f,00,72,00,46,00,69,00,6c,00,65,00,\
73,00,3e,00,44,00,6f,00,54,00,5d,00,6a,00,49,00,7b,00,6a,00,66,00,28,00,3d,\
00,31,00,26,00,4c,00,5b,00,2d,00,38,00,31,00,2d,00,5d,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,\
00,25,00,33,00,22,00,20,00,22,00,25,00,34,00,22,00,00,00,00,00
------------------------------------
ulgy, but that's all there is to it.