Creo Elements/Pro versioned data
File type: Various data file
Files with 99 file extension contain versioned data created by Creo Elements/Pro, also known as Pro/ENGINEER.
The 99 file is associated with the saved versions of Creo CAD/CAM design data.
File type category:
Various data file
Date updated: October 9, 2026
The 99 file extension is used by Creo Elements/Pro (formerly Pro/ENGINEER), a CAD/CAM application developed by PTC for Microsoft Windows.
The 99 file contains a saved version of Creo design data. Creo uses numeric suffixes to distinguish successive versions of its native design files, so the file is normally part of a related set of model, assembly, or drawing files.
Creo Elements/Pro is an older name in PTC's Creo product line. These versioned files are primarily encountered in existing Pro/ENGINEER or Creo Elements/Pro projects and may require the original software, or a compatible Creo release, to open correctly.
Open a 99 file with Creo Elements/Pro (Pro/ENGINEER) on Microsoft Windows. Use the application's Open command and select the complete filename, including its numeric version suffix.
If the file is part of a name such as model.prt.99, keep the original filename and place it with the other files from the same Creo project.
The 99 file is a versioned Creo data file rather than a general-purpose exchange format, so it normally cannot be converted directly with a standalone converter. Open it in Creo Elements/Pro or a compatible Creo release and save it as a current native design file.
Once opened, Creo can also export the design through its supported exchange formats when a neutral or downstream CAD file is required.
Software apps that create 99 files:
Microsoft Windows
Software applications that handle other tasks involving 99 files:
Microsoft Windows
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