User's attached texture is interpreted as a Single Channel Cube map instead of a Default 2D texture when importing in Unity 5.5. As a result, the preview is incorrect. In Unity 5.4 and earlier this asset is imported correctly.

Steps to reproduce:
1. Create a New Project
2. Import User's attached Unity Package "6_0_RC_VuforiaCar.unitypackage"
3. Check the settings of Editor/QCAR/TargetsetData/6_0_RC_VuforiaCar/768d7a96d00242959c522796fa984af4_preview.jpg (Inspector Tab)
4. Note that Texture Type is set to"Single Channel" and Texture Shape is set to "Cube"

Result: Texture preview is incorrect.

Reproduced with: 5.6.0a6, 5.5.0p1.
Not reproduced with: 5.4.3p3, 5.3.7p2.

Note: Setting the type to "Default" and "2D" fixes the issue and the preview is correct.