@Thomas Richard 

Thank you for your effort. With Maple 18 it works well. 

@Thomas Richard 

I've made some investigation and I can't export any matrix with datatype float8. If there is datatype anything, export works well. I use Maple 17, Office 2007 32-bit, Windows 7 64-bit.

I think if datatype of matrix to be exported would be changed, it would work. Is there any way how to do it?

Is it possible to change data type of existing Matrix? Random matrix with data type set to float8 is also resistant to export.

@AmusingYeti 

Yes. I've tried to do all this procedure with random matrices sized down to max 3 columns, exporting works well. It also works if I generate random (44,1) matrix instead of the calculated one. It seems that problem could be caused by format of numbers in the matrix. The data type is float8.