Firefox Default program settings being wrecked by installer

[Solace]

After analyzing what changes occur from setting the filetype permissions it seems that within the FirefoxHTML directory of the following registry settings are the reason behind such behavior. This is a export of the section after applying the changes via gui file types. Is the codecs suppose to be changing the file permissions for such extensions? i recall in the past that was never the case and the icon/extensions remained to be opened by firefox. If this is normal behavior from the software then this is false report by me. I do not recall this occurring in the past though.

Code:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\FirefoxHTML]
"FriendlyTypeName"="Firefox Document"
@="Firefox Document"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\FirefoxHTML\DefaultIcon]
@="C:\\Windows\\SysWOW64\\wmploc.dll,-610"
"oldicon"="C:\\Program Files (x86)\\Mozilla Firefox\\firefox.exe,1"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\FirefoxHTML\shell]
@="Play"
"oldverb"="open"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\FirefoxHTML\shell\Enqueue]
@="&Add to Windows Media Player list"
"MUIVerb"=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,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,​\
  00,75,00,6e,00,72,00,65,00,67,00,6d,00,70,00,32,00,2e,00,65,00,78,00,65,00,​\
  2c,00,2d,00,39,00,38,00,30,00,30,00,00,00

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\FirefoxHTML\shell\Enqueue\command]
"DelegateExecute"="{45597c98-80f6-4549-84ff-752cf55e2d29}"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\FirefoxHTML\shell\open]

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\FirefoxHTML\shell\open\command]
@="\"C:\\Program Files (x86)\\Mozilla Firefox\\firefox.exe\" -requestPending -osint -url \"%1\""

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\FirefoxHTML\shell\open\ddeexec]
@="\"%1\",,0,0,,,,"
"NoActivateHandler"=""

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\FirefoxHTML\shell\open\ddeexec\Application]
@="Firefox"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\FirefoxHTML\shell\open\ddeexec\Topic]
@="WWW_OpenURL"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\FirefoxHTML\shell\Play]
@="&Play"
"MUIVerb"=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,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,​\
  00,75,00,6e,00,72,00,65,00,67,00,6d,00,70,00,32,00,2e,00,65,00,78,00,65,00,​\
  2c,00,2d,00,39,00,39,00,39,00,31,00,00,00

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\FirefoxHTML\shell\Play\command]
@=hex(2):22,00,25,00,50,00,72,00,6f,00,67,00,72,00,61,00,6d,00,46,00,69,00,6c,\
  00,65,00,73,00,28,00,78,00,38,00,36,00,29,00,25,00,5c,00,57,00,69,00,6e,00,​\
  64,00,6f,00,77,00,73,00,20,00,4d,00,65,00,64,00,69,00,61,00,20,00,50,00,6c,​\
  00,61,00,79,00,65,00,72,00,5c,00,77,00,6d,00,70,00,6c,00,61,00,79,00,65,00,​\
  72,00,2e,00,65,00,78,00,65,00,22,00,20,00,2f,00,50,00,6c,00,61,00,79,00,20,​\
  00,22,00,25,00,4c,00,22,00,00,00
"DelegateExecute"="{ed1d0fdf-4414-470a-a56d-cfb68623fc58}"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\FirefoxHTML\shellex]

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\FirefoxHTML\shellex\{8895b1c6-b41f-4c1c-a562-0d564250836f}]
@="{031EE060-67BC-460d-8847-E4A7C5E45A27}"

changing "open -> Play" changes the behavior on all the file types for the shell. restoring it fixes the file types. restoring the path to FF restores the default icon and its back to normal.

also i figured out why the Firefox was completely removed on rare cases. If i install FF11 and click Restore file types it assumes the backups exists in registry and still goes ahead to remove the entries leaving nothing and removing Firefox from the default programs list and file types. The backups must exist prior to executing this script otherwise nothing will remain.