Along these lines, I did a registry search for "calibre" and found entries in the following registry keys:
HKEY_CLASSES_ROOT\Local Settings\Software\Microsoft\Windows\Shell\MuiCache - shows F:\Calibre Portable\calibre-portable.exe as an executable program.
HKEY_CURRENT_USER\Software\Classes\Local Settings\Software\Microsoft\Windows\Shell\MuiCache - shows F:\Calibre Portable\calibre-portable.exe as an executable program.
HKEY_CURRENT_USER\Software\Microsoft\IntelliPoint\ AppSpecific\calibre.exe - most interesting so far, it shows a Path value of G:\Calibre Portable\Calibre\calibre.exe (as opposed to F:\, since it might have originally been used on a thumb drive that was seen as G: instead of F
.
HKEY_CURRENT_USER\Software\Trolltech\OrganizationD efaults\Qt Factory Cache 4.8\com.trolltech.Qt.QIconEngineFactoryInterface:\ F:\Calibre Portable - really has me wondering, what this is? Especially with a name like Trolltech?
HKEY_CURRENT_USER\Software\Trolltech\OrganizationD efaults\Qt Factory Cache 4.8\com.trolltech.Qt.QIconEngineFactoryInterface:\ G:\Calibre Portable - another Trolltech entry, this one showing G: instead of F:...
HKEY_CURRENT_USER\Software\Trolltech\OrganizationD efaults\Qt Factory Cache 4.8\com.trolltech.Qt.QIconEngineFactoryInterfaceV2 :\F:\Calibre Portable
HKEY_CURRENT_USER\Software\Trolltech\OrganizationD efaults\Qt Factory Cache 4.8\com.trolltech.Qt.QIconEngineFactoryInterfaceV2 :\G:\Calibre Portable
HKEY_CURRENT_USER\Software\Trolltech\OrganizationD efaults\Qt Factory Cache 4.8\com.trolltech.Qt.QImageIOHandlerFactoryInterfa ce:\F:\Calibre Portable
HKEY_CURRENT_USER\Software\Trolltech\OrganizationD efaults\Qt Factory Cache 4.8\com.trolltech.Qt.QImageIOHandlerFactoryInterfa ce:\G:\Calibre Portable
HKEY_CURRENT_USER\Software\Trolltech\OrganizationD efaults\Qt Plugin Cache 4.8.false\F:\Calibre Portable
HKEY_CURRENT_USER\Software\Trolltech\OrganizationD efaults\Qt Plugin Cache 4.8.false\G:\Calibre Portable
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\RADAR\HeapLe akDetection\DiagnosedApplications\calibre.exe
HKEY_USERS\S-1-5-21-15890611-392985980-6498272-12734\Software\Classes\Local Settings\Software\Microsoft\Windows\Shell\MuiCache - shows F:\Calibre Portable\calibre-portable.exe as an executable program.
HKEY_USERS\S-1-5-21-15890611-392985980-6498272-12734\Software\Microsoft\IntelliPoint\AppSpecific\ calibre.exe - shows a Path value of G:\Calibre Portable\Calibre\calibre.exe
There was also another whole set of Trolltech keys under
HKEY_USERS\S-1-5-21-15890611-392985980-6498272-12734\Software\Trolltech\OrganizationDefaults\Qt Factory Cache 4.8\com.trolltech.Qt.QIconEngineFactoryInterface:\ F:\Calibre Portable that duplicated the previous set for F: and G: as well as the MUICache keys too.
This sure does seem to be a lot of registry entries pointing to specific drives and paths, especially for an application that is supposed to be portable and keep everything in the application's folders.
I'm not trying to be snippy or anything, merely trying to help point out what I'm seeing so that maybe the application can be modified to operate in the manner I'm hoping for.