Projection Code Changed?

[LonMatsuno]

I have an issue with a predefined projection in ArcGIS. Somehow the code that is passed to a WMS server by my ArcMap 9.3.1 for "NAD 1983 10TM AEP Resource" has changed to 3401 on my ArcMap.

On a colleagues ArcMap it passes the code 102185 to the WMS server. Does anyone know where this got changed/corrupted and how I can set it back?

Thanks.

[MelitaKennedy]

It's a difference between ArcGIS versions. 102185 is an Esri-assigned WKID. 3401 is the WKID assigned by the EPSG Geodetic Parameter Dataset. Because this is more widely acknowledged, we change andy Esri-assigned WKIDs to EPSG's once a definition is added to the Dataset.

Melita

Note: I'm a member of the subcommittee that maintains the EPSG Dataset.

[LonMatsuno]

Thanks Melita. I tried ArcMap10 and indeed the standard EPSG codes are sent in the request with the projections I tried.

Is it possible to update 9.3.1 to do the same, or must I upgrade my ArcMap?