A file with .tga extension is a raster graphic format and was created by Truevision Inc. It was designed for the TARGA (Truevision Advanced Raster Adapter) boards and provided highcolor/truecolor display support for IBM-compatible PCs.
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XLSX is well-known format for Microsoft Excel documents that was introduced by Microsoft with the release of Microsoft Office 2007. Based on structure organized according to the open packaging conventions as outlined in part 2 of the OOXML standard ECMA-376, the new format is a zip package that contains a number of XML files. The underlying structure and files can be examined by simply unzipping the .xlsx file.
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