In the Thinfinity® Configuration Manager's Profile Editor on the "Resources" tab you will find the following options:
The settings.ini configuration file can be found on this path:
Inside the ini file, create an [AutoDownload] section and use the 'Exclusion' key with the values that you want to exclude using Glob Expression Syntax (standard DOS mode), separated by the "|" char. You can also use the regular expression notation to indicate which files to exclude, except for the single pipe character, which is reserved for Thinfinity® Workspace to notice separation between exclusion rules. Use the double pipe character, instead, within the regex for the "or" operator.
Take a look at the following example. Notice the use of ":" at the beginning of the jpg exclusion rule and the double pipe to note that files starting with the letter a or the letter b will be excluded.