问题描述
在 Windows 8 中，用户选择为给定文档类型打开哪个应用程序似乎被保留
With Windows 8, the user's choice for which application to open for a given document type seems to be kept in
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\<extension>\UserChoice
对于我机器上的 PDF，这包含:
For PDFs on my machine, this contains:
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.pdf\UserChoice]
"Hash"="xh8KhPWlZL0="
"ProgId"="AcroExch.Document"
然而在另一台机器上，哈希值是不同的.什么正在被散列，有没有办法创建一个 .reg 文件，该文件可以应用于另一台机器来设置此首选项?
Yet on another machine the hash is different. What's being hashed, and is there any way to create a .reg file which can be applied to another machine to set this preference?
推荐答案
有人对哈希进行了逆向工程并编写了一个 CLI 工具来设置文件关联:
Someone reverse engineered the hash and wrote a CLI tool to set file associations:
extension = ".txt"; the file extension
sid = "S-1-5-21-463486358-3398762107-1964875780-1001" ; the SID of the current user
progid = "txtfile"; the ProgId of the desired association
regdate = "01d3442a29887400"; timestamp of the UserChoice registry key
experience = "a microsoft secret string"; a static string (this is a dummy example, not the real string
hash = Base64(MicrosoftHash(MD5(toLower(extension, sid, progid, regdate, experience))))
并未透露所有细节，但可能足以对其余细节进行逆向工程.
Not all details are revealed but probably enough to reverse engineer the rest.
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