HELP with vrim2exr...huge file

[Kidutm]

Hy guys, i need help. Ihave rendered a 18k/18k at 30dpi vrimg file. It has 37 GB, 12 channels in file, but when i whant to extract the channels i can't.

The message is: Specified channel name "Diffuse" not found or channel is not a RGB channel.

 

When i type -info, i can see all the channels and says that are RGB channels.

File "l:\18x18.vrimg":

Resolution: 18000 x 18000

Number of channels: 12

"RGB color"; type: RGB color; alias: Color

"Alpha"; type: RGB color; alias: Alpha

"VRayBackground"; type: RGB color; alias: Background

"VRayDiffuseFilter"; type: RGB color; alias: Diffuse

"VRayGlobalIllumination"; type: RGB color; alias: GI

"VRayLighting"; type: RGB color; alias: Light

"VRayReflection"; type: RGB color; alias: Reflect

"VRayRefraction"; type: RGB color; alias: Refract

"VRaySelfIllumination"; type: RGB color; alias: SelfIllum

"VRayShadows"; type: RGB color; alias: Shadow

"VRaySpecular"; type: RGB color; alias: Specular

"VRayZDepth"; type: float; alias: ZDepth

 

Please help me, its very urgent!!!

Thx in advance