Juan,
I have just updated to latest version of PixInsight v1.8 RC7. Unfortunately, DCRAW is still having difficulty with Canon 1DX files. Here is the output:
Reading 1 image(s):
W:/1dx/Comet Pan-STARRS/_S1P2561.CR2
Timestamp: Thu Apr 11 20:29:01 2013
Camera: Canon EOS-1D X
ISO speed: 1600
Shutter: 89.9 sec
Aperture: f/1.$
Focal length: 0.0 mm
Embedded ICC profile: no
Number of raw images: 1
Thumb size: 5184 x 3456
Full size: 5344 x 3584
Image size: 5218 x 3482
Output size: 5218 x 3482
Raw colors: 3
Filter pattern: RGGBRGGBRGGBRGGB
Daylight multipliers: 2.087780 0.940896 1.135858
Camera multipliers: 1975.000000 1024.000000 1444.000000 1024.000000
Invoking: dcraw -w -D -k 0 -t 0 -o 0 -4
Decoding Canon EOS-1D X file (5218x3482 pixels, ISO=1600, Exposure=89.90s): —
*** PCL Win32 System Exception: At address 00000000770BE4B4 with exception code C0000005 :
Access violation: invalid memory write operation at address 0000000140C2EF4C
<* failed *>
*** Error: Unable to read image: W:/1dx/Comet Pan-STARRS/_S1P2561.CR2
Sorry about being the bearer of bad news.
![Sad :sad:](http://pixinsight.com/forum/Smileys/default/sad.gif)
Wade