File Type Doctor will not only protect the selected filename extension
and associated file type with one click, but all linked filename extensions
as well.
Most programs and installers won??™t have a problem with
locked file types; they??™ll likely just ignore the error and move
on. But it??™s not beyond the realm of possibility that an application
may crash or refuse to continue until it has all the
Registry access it needs. In this case, you may need to unlock
the affected file types first, so you??™ll want to back them up as
described earlier in this section.
To remove the lock, just select a locked file type (you can click the leftmost
column header to group all locked file types together) and click the Unlock
button.
File Type Associations | 141
The Registry
Expand the Scope of Your File Types
To every rule there??™s an exception, and in Windows Vista, doubly so. In
???Anatomy of a File Type,??? earlier in this chapter, the basic file types system
is laid out, with a collection of keys named for filename extensions (e.g.,
HKEY_CLASSES_ROOT\.jpg) and the corresponding file type keys (such as HKEY_
CLASSES_ROOT\jpegfile). As it turns out, there??™s yet another connection in
the Registry that affects your file types.
Many extension keys??”like HKEY_CLASSES_ROOT\.jpg??”contain values named
PerceivedType, which point to subkeys of HKEY_LOCAL_MACHINE\SOFTWARE\
Classes\SystemFileAssociations. The keys therein work like ordinary file
type keys, but they??™re much broader in scope.
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