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Problem: Unable to add a custom command to ArcMap or ArcCatalog using the Add from file option

Description

In the ArcMap and ArcCatalog Customize dialogs, I am unable to add a custom command defined in a compiled DLL. When I click Add from file and navigate to the correct directory, the DLL does not show up.

Cause

Windows Explorer is configured to hide system files and DLLs.

Solution or Workaround

Configure Windows Explorer to show all hidden files.

-- Windows NT:
1. Open Windows Explorer.
2. Select View > Options and click the View tab.
3. Select the Show all files option.
4. Click OK to apply the changes.

-- Windows 2000:
1. Open Windows Explorer.
2. Select Tools > Folder Options and click the View tab.
3. Select the Show hidden files and folders option.
4. Click OK to apply the changes.