To start search use the -Search (-s) key:

-Search

-s

Search query to execute should be provided in the -SearchQuery (-sq) parameter:

-SearchQuery “search query”

-sq “search query”

Example:

WinCatalog.exe –o “d:\my catalog.w3cat” –s -sq “*.jpg”

Start WinCatalog, open the catalog file “d:\my catalog.w3cat”, open Search tab, find items (files, folders, etc) matching the “*.jpg” search query (without quotes).