Convert ase to u3d

Download and install the latest version of Filestar.
Right click on one or more Ase file(s) on your desktop and select Convert with Filestar.
Type convert to u3d in the search box.
Press Convert.

What is the difference between .ase and .u3d?

Name: 3D Studio Max ASCII Export File; Universal3D
Extension: .ase; .u3d
Format: Text; Text
Category: 3D; 3D
Developer: Autodesk, Inc.; 3D Industry Forum
Description: An Autodesk ASCII Scene Export file stores a 3D scene as text.; Universal 3D (U3D) is a compressed file format standard for 3D computer graphics data.
MIME Type: application/x-3ds; application/vnd.hzn-3d-crossword
Sample: sample.u3d
Wikipedia: .u3d on Wikipedia