There is only one file type that uses the .TOPPRJ extension:
TopSolid Project File
CAD design package file used by TopSolid, a software solution for managing CAD projects; may store references to part and assembly design documents, bill of materials documents, drawing drafts, and exploded part design documents; used for consolidating and organizing CAD project documents.
By default, TOPPRJ files are stored within subdirectories of TopSolid's TopSolidPdm\ directory (which is created by default as C:\TopSolidPdm\). The software's user interface encapsulates access to all project files, so TOPPRJ files are not accessed directly by the user.
NOTE: TopSolid uses an embedded Microsoft SQL Server to store project documents and data.
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Updated: June 9, 2011