When you try to catalog a compressed backup created with Symantec Backup Exec, the Cataloging Media page may display the following error: "Unknown compression algorithm."
The Symantec Backup Exec files Beclass.dll and Bestdutl.dll are not copied to a folder specified in the PATH environment variable on the computer where Recovery Manager for Exchange is installed. Or besocket.dll and vxcrypto.dll are required by the backup and are not in a folder specified in the PATH environment variable.
Copy the Beclass.dll and Bestdutl.dll files from the computer where Symantec Backup Exec is installed to the Windows installation folder (%systemroot%) on the computer where Recovery Manager for Exchange is installed.
To open the Windows installation folder:
1. Open Windows Explorer.
2. In the Address bar, type the following: %systemroot%
3. Press ENTER.
4. If error still persists
1:) add the following dll files from Backup Exec to the same folder