It seems that both .wcat and .wcl files originate from a program called WinCatalog, which is used to catalog large collections of files, including music, movies, pictures or documents. If any programs can convert or export .wcl file to a .wcat file, it would be this software. We do not know about any other 3rd party software capable of handling these two file types.
Convert WinCatalog document file to WinCatalog collection file.
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert wcl to wcat on Windows
A catalog system for music, movies, pictures and documents
Convert from wcl file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.