batch file process for cognos powerplay 7.3

hi all im trying to run a batch file that i have scheduled to run 10pm everyday though it does not run correctly.
in scheduled tasks it completes ok as i get a 0x00 under status but when i check the date modified for the files it reverts back to last month and earlier.

heres the batch file i am trying to run:

C:\Program Files\Cognos\cer4\bin\Trnsfrmr.exe -n -i -r4 “G:\IT\Cognos\PowerPlay\models\sales.pyi”

Del “I:\cognos\sales.mdc”

copy “G:\IT\Cognos\PowerPlay\cubes\sales.mdc” “I:\cognos\sales.mdc”

thanx Manu