.WDSEML File Extension
File TypeThunderbird Searchable Email File
What is a WDSEML file?
File created by Mozilla Thunderbird, a free email and news program; contains email message information and enables Windows search to find specific content in the emails when performing Windows searches; provides a convenience for Windows Thunderbird users.
WDSEML files are created when the user chooses to enable Windows search integration in Thunderbird (, then select Advanced → General → System Integration → Allow Windows search to search messages). You can turn off the generation of these files by unchecking the option.
NOTE: WDSEML stands for "Windows Desktop Search Email."