Export/Import Tool JNeuhoff - Model number

I've installed Export/Import Tool ver. 1.1.0 in opencart 1.5.5.1

It's working fine, except the model field in the exported xlsx file:
While i give a model number "01.300" for a product in administration panel, the same field in the exported file turns to "1.3" (without zeroes). Is this a module bug or something to do with microsoft excel? i've tried to open the exported file with open-office but it couldn't open it...