Specialized utilities for Nokia phones can explore and extract some data from various Nokia backups, including the ARC format that contains backup of data from storages. Hence you can use programs like Noki to extract and recover many useful data, including contacts and documents from these backups.
Convert Nokia backup archive to Microsoft Excel 97 to 2003 workbook.
We found one software available in the database for this conversion.
Microsoft Windows software - convert arc to xls on Windows
A small usefull program for exploring and extracting of files created with Nokia PC suite
Convert from arc file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.