The following formats can be read by TurboCAD, either for import, export, or both. Some formats have a Setup in which you can set certain parameters for conversion. If you do not specify conversion parameters, the defaults will be used. (If no Setup is indicated, the conversion requires no additional input.)
Image Removed
3DS: AutoDesk 3D Studio format. 
3DV: VRML Worlds (import only)
ASAT: ACIS solid modeling file format for storing graphics as ASCII files. 
BMP: Bitmap format, TurboCAD for Windows (export only). A bitmap is a representation of a graphic image consisting of rows and columns of dots. 
CGM: Computer Graphics Metafile. 
DAE: Collada files (export only). 
DCD: DesignCAD (import only)
DGN: Intergraph Standard file format. 
DWF: Drawing Web format.  Import is automatic.
DWG: AutoCAD native format for vector graphics. 
DXF: Drawing eXchange format, used by AutoCAD to interact with other applications.
EPS: Encapsulated Post Script format. 
FCD: FastCAD DOS format (import only)
FCW: FastCAD Windows format (import only). 
GIF: Raster graphic format (export only). 
GEO: VRML Worlds (import only)
IGS: IGES format.

Note: IGS is a file format for a public domain called IGES which is actually a neutral file format intended as an international standard for the exchange of data between different CAD/CAM systems. IGES is an ANSI standard maintained by the IGES/PDES Organization (IPO), under the direction of the National Institute of Standards and Technology (NIST). The National Computer Graphics Association (NCGA) acts as the administrator of the standard.

JPG: JPEG image compression standard, full 24-color. TurboCAD for Windows (export only). 
JPG: JPEG format, SDK sample filter (export only)
OBJ: Geometry definition format. 
PLT: Hewlett-Packard Graphics Language. 
PNG: Raster graphic format (export only). 
KML: (Import) Is a file format used to display geographic data in an Earth browser such as Google Earth. KML uses a tag-based structure with nested elements and attributes and is based on the XML standard.
KMZ: (Import is a file extension for a placemark file used by Google Earth. KMZ stands for Keyhole Markup language Zipped. It is a compressed version of a KML (Keyhole Markup Language) file. Keyhole was the founding company of the Earth Viewer software that Google Earth was built upon.
PDF: Adobe Portable Document Format
PDF(3D): Adobe 3D Portable Document Format
SAT: ACIS solid modeling file format for storing graphics as ASCII (SAT - Save As Text) files. 
SHX: Format that saves selected entities as a single shape, that can be used in a line style (export only). This is not the same as *.shx font format. 
SKP: SketchUp file format.
STL: Stereo Lithograpy format. 
STP, STEP: Step format.
SVG: Web graphic format (export only).
U3D: Universal 3D (U3D) is a compressed file format standard for 3D computer graphics data.
WMF: Windows MetaFile format, saves graphics as a series of records that correspond to graphics function calls, such as drawing straight lines, curves, filled areas, and text. 
WRL: Format for saving graphics as a Virtual Reality Model Language (VRML) description. 
WRZ: VRML Worlds
XLS: Spreadsheet format (export only)The following formats can be read by TurboCAD, either for import, export, or both. Some formats have a Setup in which you can set certain parameters for conversion. If you do not specify conversion parameters, the defaults will be used. (If no Setup is indicated, the conversion requires no additional input.)
Image Added

...

Note: IGS is a file format for a public domain called IGES which is actually a neutral file format intended as an international standard for the exchange of data between different CAD/CAM systems. IGES is an ANSI standard maintained by the IGES/PDES Organization (IPO), under the direction of the National Institute of Standards and Technology (NIST). The National Computer Graphics Association (NCGA) acts as the administrator of the standard.

...

SKP File Import Setup

  
Use "ByLayer" color for entities without material: Assign the SketchUp layer color to any entity that does not have an assigned material.
Import Hidden Entities: Imports entities which are hidden in the SKP. If this option is off hidden entities will nor be imported.
Import dynamic components: Dynamic block are imported as PPM objects.
SKP materials are imported and supported for both RedSDK and Lightworks.

...

  
Select a version of VRML file to save. You can also explode the drawing text while creating the file for export.

U3D Export Setup

1) Give an allow to control layer prefixes: Now each layer in U3d file has predefined prefix: "TCLayer_". User wants to change (edit) it.
2) Save drawing hierarchy in U3d file. In this case Adobe pdf reader shows it.

Export the drawing hierarchy into a U3D file (groups, block insertions):
1. User will have ability to choose export the drawing hierarchy or layers into a U3D file.
2. User will have ability to change the layer prefix.
3. This options will be available from the export setup dialog.

Following CAD Formats has have been Improved 

OBJ filter. Import materials

Added import RedSDK and Lightworks materials.
Supported features:
 - diffuse color
 - transparency
 - reflection
 - texture map
 - bump map (RedSDK only)
 - reflection map (RedSDK only)

Support of Rhino 5 files (3DM) files

Latest openNURBS toolkit is incorporated

Import STEP format improvement

Import text attributes from STEP file

User can access the text information and would like to read it out with VBA (TurboCAD-VBA-Object-Catalog) and store the text into the “Info” Property.

...

Note : It support sboth supports both .step STEP & .stp STP files.

...