This article was previously published under Q318326
This article has been archived. It is offered "as is" and will no longer be updated.
The Microsoft Office filter, Offfilt.dll, does not support all versions of Microsoft Office documents.
The following versions are supported:
Office 95 and later are supported. This does not include RTF or other formats saved as a .doc file.
.xls, .xlt, .xlb, .xlt
Office 95 and later are supported.
.ppt, .pps, .pot
Office 97 and later are supported.
Binder files are not supported. Some earlier versions of the filter registered for this extension but the support never existed.
Limited support exists that is handled by the HTML filter.
This is not currently supported.
The Office filter looks at the first 4 bytes in the header of each file for a docfile0 signature. To manually check the signature, use a hex editor to open the file to determine whether the signature matches the following one:
D0 CF 11 EO
If this docfile signature does not exist, the file is not filtered by the Office filter. Files that are created in Microsoft Word for Microsoft Windows version 2.0 are an example of the files that do not contain the docfile signature, so they are not filtered. In addition, no error messages are logged when the document is not filtered.