It's important you understand how the tables are stored. A table is made of an array of rows; a row is a structure let's call it this way for the moment to make things easier. After the rows of a given table end, the rows of the next table follow. The problem with a row remember, think of it like a structure is that some of its fields aren't always of the same size and they change from assembly to assembly, so you have to calculate them dynamically.
For example, I talked about the HeapOffsetSizes field and how it tells us the size that indexes into the " String", " GUID" and " Blob" streams will have; this means if I have in a structure of one of these tables an index into the " String" stream, its size is determined by HeapOffsetSizes, and so it could be a word or a dword.
Of course that's not the only kind of index that can change of size, there are others. A very simple one to calculate is a direct index into another table. The remaining indexes are the most annoying, they can index into a table or another. The Microsoft documentation is not so clear about this at all , so I'll try to explain it in an easy way. The low bits of the value tell us which table is being indexed and the remaining bits represent the actual index; since the choice is between 3 tables, it only takes 2 bits to encode the table for this kind of index.
So if we have a word and the 2 low bits are reserved to encode the table that is being indexed, the remaining 14 bits can index a row in one of the three tables, but what if one of those 3 tables has more rows than a value of 14 bits can encode? Well, then a dword is needed.
So, to get the size of an index like this it's necessary to compare the rows of each table it can reference, get the table with the biggest number of rows and then see if this number fits into the remaining bits of a word, if not, a dword is required. I paste you from the SDK the list of this kind of indexes and the values to encode the tables for each index type which is the "Tag" column :.
HasSemantics: 1 bit to encode tag Tag Event 0 Property 1. If not, you should try reading it again And again. Now, I will list each table, give a brief description of it and whatever I have to say in addition and list copy them form the SDK its columns.
Ah, before I forget, a token is a dword-value that represents a table and an index into that table. I think this is pretty simple to understand if you understood all the other stuff. Each row represents an imported class, its namespace and the assembly which contains it. The run continues to the smaller of: o the last row of the MethodDef table o the next run of Methods, found by inspecting the MethodList of the next row in this TypeDef table. Name describes how.
The meaning of the values of these 2 bits is unspecified. Each row represents a field in a TypeDef class. The fields of one class are not stored casually: after the fields of one class end, the fields of the next class begin.
Each row represents a method in a specific class. The methods sequence follows the same logic of the fields one. It marks the first of a contiguous run of Parameters owned by this method. The run continues to the smaller of: o the last row of the Param table o the next run of Parameters, found by inspecting the ParamList of the next row in the MethodDef table.
The RVA points to the method body, I'll explain the format of that later. I think the best description is given by the SDK: "The CustomAttribute table stores data that can be used to instantiate a Custom Attribute more precisely, an object of the specified Custom Attribute class at runtime. The column called Type is slightly misleading — it actually indexes a constructor method — the owner of that constructor method is the Type of the Custom Attribute. Well, this is kind of the same thing for.
It's useful when handing something from managed to unmanaged code. It marks the first of a contiguous run of Events owned by this Type. The run continues to the smaller of: o the last row of the Event table o the next run of Events, found by inspecting the EventList of the next row in the EventMap table. It marks the first of a contiguous run of Properties owned by Parent. The run continues to the smaller of: o the last row of the Property table o the next run of Properties, found by inspecting the PropertyList of the next row in this PropertyMap table.
Links Events and Properties to specific methods. For example one Event can be associated to more methods. Each row represents a specification for a TypeDef or TypeRef. The only column indexes a token in the Blob stream. I quote: "The ImplMap table holds information about unmanaged methods that can be reached from managed code, using PInvoke dispatch.
This means all the unmanaged functions used by the assembly are listed here. Not relevant for fields. Each row is an extension for a Field table. The RVA in this table gives the location of the inital value for a Field. The PublicKey is! I quote: "The ExportedType table holds a row for each type, defined within other modules of this Assembly, that is exported out of this Assembly.
In essence, it stores TypeDef row numbers of all types that are marked public in other modules that this Assembly comprises. Be careful, this doesn't mean that when an assembly uses a class contained in my assembly I export that type. In fact, I haven't seen yet this table in an assembly. This field is used as a hint only. If the entry in the target TypeDef table matches the TypeName and TypeNamespace entries in this table, resolution has succeeded.
This can be an index more precisely, an Implementation coded index into one of 2 tables, as follows: o File table, where that entry says which module in the current assembly holds the TypeDef o ExportedType table, where that entry is the enclosing Type of the current nested Type.
If the Implementation index is 0, then the referenced resource is internal. I wrote an article you can either find on NTCore or codeproject about Manifest Resources, anyway I quote some parts from the other article to give at least a brief explanation, since this section is absolutely undocumented. There are different kinds of resources referenced by this table, and not all of them can be threated in the same way.
Reading a bitmap, for example, is very simple: every Manifest Resource begins with a dword that tells us the size of the actual embedded resource And that's it After that, we have our bitmap. Ok, but what about those ". For every dialog in a. The first and the easiest one is to right-click on the selected NT file. From the drop-down menu select "Choose default program" , then click "Browse" and find the desired program.
The whole operation must be confirmed by clicking OK. The second and more difficult to do is associate the NT file extension to the corresponding software in the Windows Registry. Many files contain only simple text data.
It is possible that while opening unknown files e. NT with a simple text editor like Windows Notepad will allow us to see some of the data encoded in the file. The following content provides specific steps.
Warning : Because the formatting process will delete all data on the external hard drive, please make sure you have already a file backup. Usually, the above 3 methods can help you format hard drive to NTFS successfully. However, sometimes they cannot format external hard drive to NTFS as expected like the below real user story:.
Now it won't work. It is a free tool that can identify more than 11, different kinds of files - most likely yours too! It will help you find software that can handle your specific type of file.
Download File Analyzer here. Home File Types NT. Update info Upload example file. Various viewers for this file format These apps are known to open certain types of NT files. We have not verified any software that we know for certain will work with NT-files on Mac.
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