There is only one file type that uses the .VRIMG extension:
V-Ray Image File
Image format developed by Chaos Group and created by V-Ray, a rendering engine plugin used with other design-oriented applications, such as 3DS Max and Maya, to render scenes quicker; stores image data as it is being rendered by the engine.
The VRIMG file can be used as a preview in order to see what is being rendered. It is especially useful for preserving memory when rendering huge resolutions.
NOTE: VRIMG files can be converted to .EXR files to be opened by Photoshop or After Effects with the ProEXR plugin.
Updated: December 11, 2014