Well at first yes (error 193). I checked dism log; and it seems that the custom temporary folder i had defined, for some reason, couldn't be accessed by dism.exe... (I had given it the same permissions as the default temp folder, but...)
Then, when I reset it to default direction, it run without any problems or error. So, now I triggered it back to my custom location (my windows drive is SSD, and i like to be reserved from unnecessary writes).