When files are uploaded to the Alfresco Content Services CMIS server they should have a mimetype associated with them. Desktop Sync contains a list of built-in file extension to mimetype mappings, but in some cases it may be necessary to add new mappings or override existing mappings.
The CMIS content type mappings are specified as cmis.contentType.<n>=<extension>,<mimetype>, where <n> is an ascending number starting at one.
Here is a sample CMIS content type mapping configuration section:
# CMIS content type mappings cmis.contentType.1=pptx,application/vnd.ms-powerpoint cmis.contentType.2=test,application/test