It seems like you're referring to Relief files for ArtCAM and Apire. These are file formats commonly used in CNC (Computer Numerical Control) or CAM (Computer-Aided Manufacturing) software for 3D modeling and carving.

1. ArtCAM:ArtCAM was a popular software for creating 3D reliefs, typically used in wood carving and CNC machining. It supports several file formats, including:

.art: ArtCAM’s proprietary file format.

.stl: A common 3D modeling file format for 3D printing and CNC milling.

.dxf: A file format commonly used for CAD designs.

.bmp, .jpg, .png: Image formats that can be converted into reliefs.

1. Apire (Aspire by Vectric):Aspire is another CNC software tool for creating 3D reliefs. It allows for the design of 3D models, reliefs, and CNC toolpaths. The file formats used by Aspire include:

.crv: Aspire’s file format for saving projects.

.stl: For 3D models.

.dxf: For 2D vectors.

.bmp, .jpg, .png: Image formats that can be converted into 3D reliefs.

If you want to create or convert relief files between ArtCAM and Aspire, you may need to use STL or DXF formats as intermediate files. For image-based reliefs, you can often convert bitmap images (such as BMP or PNG) into 3D relief models in both software programs.

If you need specific help with these files or software, let me know!