Why NX shows small and large letters ? Problem importing.

Hello

We have a part naming guide of PULxxxxx.prt in large letters ( like PUL000004, Teamcenter 11 ).

Now someone named native parts with small letters pulxxxxx.prt and NX 11 Import Assembly into TC gives an error and does not automatically change pul to large letters PUL .

How to change the small letters pul to large letters PUL ?

• Windows says during NX Save As ERROR="same name file already exists in the folder"

I want all those pul- to PUL- before importing the assembly. How is this possible ?