When using and export definition and exporting constituents, some constituent names have special characters, like umlaut or tilde. These characters may not translate into other applications such an email.
CRM exports in .xls or .csv format, which uses UTF-8 encoding. This is not configurable. If another application cannot read this encoding properly, there may be some configuration changes that could be made to that application, or else it's not compatible with UTF-8 format.
Steps to Duplicate
1. Create an export of constituents that have names with special characters 2. Run the export process