There are 3 other file types using
the 3TF file extension!
.3tf - Crystal Reports chart
.3tf - BI Query Chart Editor data
.3tf - MapInfo graph data
Detailed description
Software that open 3tf file
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What is 3tf file? How to open 3tf files?
The 3TF file extension is associated with the PGSDK.
The default software associated to open 3tf file:

PGSDK 
Company or developer:
Three D Graphics, Inc.
The PGSDK is popular C/C++ professional charting library for Windows, Linux and all major flavors of UNIX
Help how to open:
Due the variability and uncertainty of this file type group, there is no general information available, about how to open this various data file format. However most files with extension from this group are usually not meant to be opened or viewed directly. If there are associated applications or programs listed below the extension description, you can always try to check their website for additional informations on their forums or other type of customer support.
For general information try to look at:
Identifying unknown file formats
How to convert:
Due the variability and uncertainty of this file type group, there is no general information available, about how to convert this various data file format. However most files with extension from this group are usually not in formats, which can be converted. If there are associated applications or programs listed below the extension description, you can always try to check their website for additional informations on their forums or other type of customer support.
List of recommended software applications associated to the .3tf file extension
Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open 3tf file, edit 3tf file, convert 3tf file, view 3tf file, play 3tf file etc. (if exist software for corresponding action in File-Extensions.org's database).
Unspecified and all other actions for computer programs working with 3tf file - ThreeDGraphics PGSDK file
Click on the software link for more information about PGSDK. PGSDK uses 3tf file type for its internal purposes and/or also by different way than common edit or open file actions (eg. to install/execute/support an application itself, to store application or user data, configure program etc.).
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