In an effort to create an open document standard, Microsoft in collaboration with ISO/IEC and Ecma, developed the Office Open XML standard in 2006. One of the filename extensions supported in this specification is the .docx extension, a text document filename extension. The .docx was introduced in Microsoft Office Word 2007 and has been supported ever since in later iterations. It has become the default filename extension for all text documents produced using Microsoft Office Word. Given the open source nature of the XML specification, more alternative document processing applications support read and write capabilities on documents saved with the .docx filename extension. This is in comparison to the .doc filename extension which is a proprietary asset owned by Microsoft.
The .pdb filename extension refers to the program database file format authored by Microsoft. The format is used for storing debugging information about executable files and programming libraries or DLL files. The pdb format was designed to ease the debugging process of executables and program modules by decoupling the debugging information from the end of the program or class library itself to allow the integrated debugger and linker to access the pdb files directly. It doing so, the PDB format facilitates the stepping into/out of runtime libraries. The format and its internals remain the proprietary asset of Microsoft.
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The .docx filename extension is specified in the open standard ISO/IEC 29500-1:2012. A free compatibility update allows older versions of Microsoft Office Word such as Office 2003 to open .docx documents.
Within windows, when an application is debugged using the Microsoft suite of debugging tools, the program database file or .pdb file is used to determine the current execution state and to locate symbols within the applications source code. Typically, the pdb file will contain global/local variables, function names and their point of entry, frame pointer omission records, and source line numbers.
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