x64 Windows7にAC-3 ACM Codecをインストールする方法
記事「Making 32-bit VFW-ACM codecs available to XP 64-bit Edition.」より
重要なので、なくならないようにないように丸々引用しました。
　
＜方法＞
　こちらから、AC-3 ACM Codec1.4 (September 22, 2007)の”AC3ACM.zip (60 KB)”を入手して解凍。
　AC3ACM.inf ファイルをメモ帳で編集： 下記の区切り線内を丸ごとコピーして置き換えて保存。
　AC3ACM_x6432.inf にリネームして、右クリック「インストール」を実行する。

以下 の記事は64ビット版Windows XPに32ビット版のAC-3 ACMをインストールする方法だが、Window 7
でもこの方法で成功する ＼(^o^)／
gastorgrab posted 2006 Dec 11 05:29

This is to enable the 32-bit codec on XP 64-bit edition only! It will allow VirtualDub-Win32
(the standard version) to have AC3ACM codec available. It will make no difference on VirtualDub x64.
 It does appear that 32-bit VFW-ACM codecs can exist on the 64-bit system at the same time.
This one seems to be working for 32-bit version of AC3ACM on XP 64-bit; :
:
; AC-3 ACM Codec install file - 15dec06
; Usage: right-click on this file and choose "Install"
; For 32-bit codec on WindowsXP 64-bit Edition

[Version]
Signature = "$Windows NT$"
Class = MEDIA

[Strings]
DisplayNameWin="AC-3 ACM Codec"
UninstallDispName="AC-3 ACM Codec (32-bit)"
UninstallPath="Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\AC3ACM"
MediaClassName="Media Devices"
mfgname="fccHandler"

[SourceDisksNames]
1=%DisplayNameWin%,"",1

[SourceDisksFiles]
AC3ACM_x6432.inf=1
AC3ACM.acm=1

[DefaultInstall]
CopyFiles = AC3ACM.Copy, AC3ACM.Copy.Inf
AddReg = AC3ACM.AddReg

[DefaultUnInstall]
DelFiles = AC3ACM.Copy, AC3ACM.Copy.Inf
DelReg = AC3ACM.DelReg

[AC3ACM.Copy]
AC3ACM.acm

[AC3ACM.Copy.Inf]
AC3ACM_x6432.inf

[AC3ACM.AddReg]
HKLM,SYSTEM\CurrentControlSet\Control\MediaResources\msacm\msacm.ac3acm,Description,,%DisplayNameWin%
HKLM,SYSTEM\CurrentControlSet\Control\MediaResources\msacm\msacm.ac3acm,Driver,,"AC3ACM.acm"
HKLM,SYSTEM\CurrentControlSet\Control\MediaResources\msacm\msacm.ac3acm,FriendlyName,,%DisplayNameWin%
HKLM,"Software\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Drivers32","msacm.ac3acm",,"AC3ACM.acm"
HKLM,"Software\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Drivers.desc",AC3ACM.acm,,%DisplayNameWin%

HKLM,%UninstallPath%,DisplayName,,%UninstallDispName%
HKLM,%UninstallPath%,UninstallString,,"%16425%\rundll32.exe setupapi,InstallHinfSection DefaultUninstall 132 %17%\AC3ACM_x6432.inf"

[AC3ACM.DelReg]
; HKLM,SYSTEM\CurrentControlSet\Control\MediaResources\msacm\msacm.ac3acm
HKLM,Software\Wow6432Node\Microsoft\AudioCompressionManager\DriverCache\msacm.ac3acm
HKLM,"Software\Wow6432Node\Microsoft\Windows NT\CurrentVersion\drivers.desc","AC3ACM.acm",,""
HKLM,"Software\Wow6432Node\Microsoft\Windows NT\CurrentVersion\drivers32","msacm.ac3acm",,""

HKLM,%UninstallPath%

[DestinationDirs]
DefaultDestDir = 16425 ; SysWOW64
AC3ACM.Copy = 16425 ; SysWOW64
AC3ACM.Copy.Inf = 17 ; Inf


The only problem with it seems to be that on uninstall it will also kill part of the REG entries for
the 64-bit version of AC3ACM. I havn't decided what to do about it
.............A person could always reinstall the 64-bit 'AC3ACM.inf' though.

 --edit--
 The separate Uninstall entries appear like this in 'Add-Remove' list;

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