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Bug: After installing ArcGIS 9.3.1 SP2, there are issues with map documents opening in a new ArcMap session by clicking on them

Description

After installing Service Pack 2 for ArcGIS Desktop 9.3.1, opening a map document from Windows Explorer, ArcCatalog, Windows Desktop, Windows Recent Documents, or the Web does not open it in a new ArcMap session. So, if an existing map document is opened, ArcMap opens as expected; however, if another map document is now opened, a new instance of ArcMap is not started. Instead, the map document is sent to the existing instance.

Cause

This is a known issue. For updates on the status, use bug number NIM059009. To work around this issue, follow the instructions below.

Workaround

Download and install the ArcGIS 9.3.1 Service Pack 2 Desktop Layer Packaging Patch.

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