VStudio and xsd.exe create different schema

[Tomerland]

Dear readers, for an xml-file I creat the corresponding schema-file (.xsd) in two ways: a) with VStudio and b) with the tool "xsd.exe" Both results are in some way different. e.g. at data-types or at the label "minoccurs". It seems not to be so dramatic. But, I use these schema-files for xmlmaps in excel, and here I have a dramatic impact. I get totally different behavior for both xsd-version. Does anybody know, why both tools give a different result? For my use-case, the VStudio-generated xsd is better, but how can I access is without Vstudio? Thanks in advance