About Symbian UIDs

UID1-First UID (Type)

UID1-Indicates whether this is an executable file or data file.

UID value	Numeric value (Hex)	Meaning
KExecutableImageUid	0x1000007A	Indicates this an .exe executable file
KDaynamicLibraryUid	0x10000079	Indicates this a DLL(executable) There are various types, with different extension(.dll, .app, .ldd, .pdd)
KDirectFileStoreLayoutUid	0x10000037	Indicates this is a direct file store (data, not executable)Bracketed values from header files
KPermanentFileStoreLayoutUid	0x10000050	Indicates this is a permanent file store(data, not executable)

UID2-Second UID (Subtype)

UID2-The meaning of this Uid depends on the value of UID1.

• If UID1 was KExecutableImageUid, UID2 isn’t used.
• If UID1 was KDaynamicLibraryUid, UID2 will be

UID value	Numeric value (Hex)	Meaning
KSharedLibraryUid	0x1000008D	Indicates this is a static interface DLL (.dll)
KUidApp	0x100039CE	Indicates an application conforming to APPARC(includes all Qikon apps, .app)
KLogicalDeviceDriverUid	0x100000AF	Indicates his is a logical decive driver (.ldd)
KPhysicalDeviceDriverUid	0x100039D0	Indicates this is a physical device driver(.pdd)

• If UID1 was KDirectFileStoreLayoutUid or KPermanentFileStoreLayoutUid, then UID2 can be:

UID value	Numeric value (Hex)	Meaning
KUidAppDllDoc	0x10003A12	Indicates this is a file store created by an .app to store user data (i.e, a document)
KUidAppInfoFile	0x10003A38	Indicates this is an AIF file (a type of file store)

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Secure ID – UID3-Third UID (sub-subType) (Subtype)

UID3-This UID has a unique value for each individual application program and is also used as the Secure ID. For UIKON applications it is used to associate data files with programs

• For .dll and .exe’s , it identifies the particular binary.
• For .apps (UIKON applications) it identifies the particular application program.
• For file stores that were created by .apps, it identifies the application program associated with this file.
• For other file stores, It’s not typically used (but you could use it for anything you want).

The SecureID for a binary is not specified explicitly, instead it is taken to be the same as the third UID. If an application has a secureID of zero, this mean ‘undefined’ , and has several consequences, including lack of privacy for data used by application.