Non standard OS sap system user names

Hello,

We are going to install a new NW 7.4 system but have a strange request from domain admins to not using default usernames for SAP domain accounts (<SID>adm, SAPService<SID>, etc) but with ".svc" at the end (<SID>adm.svc).

I couldn't find any information if this will cause problems or not. Does anybody tried a usernames with point in it? Any information helpful for prove that this is not suitable also will be appreciated.

Thanks in advance,

Biser