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Problem: Cannot see Excel 2007 .xlsx files in ArcCatalog or in ArcMap Add Data dialog box

Description

Cannot see Microsoft Excel 2007 .xlsx files in ArcCatalog or in ArcMap Add Data dialog box, even when a valid Excel 2007 spreadsheet exists and is a supported ArcGIS Desktop input format.

Cause

The file 'GxObjFactCache.dat' is corrupted. This file is located at:
C:\Documents and Settings\<user>\Application Data\ESRI\ArcCatalog\GxObjFactCache.dat

Solution or Workaround

Delete the corrupted file (GxObjFactCache.dat) located at:

C:\Documents and Settings\<user>\Application Data\ESRI\ArcCatalog\GxObjFactCache.dat

The next time ArcCatalog or the Add Data dialog box in ArcMap is accessed, this file is regenerated.