It is not generally possible to just "simply" convert EXE files to DLL format. That's work for a programmer, so it is very unlikely you would find some utility that could reliably do exe to dll conversion.
If you are looking for something particular, or know anything useful, please let us know in the discussion below.
Updated: January 18, 2017
This conversion entry was verified by us and conversion was flagged as wrong or not possible.
Usually this happens when the conversion would try to convert different types of data between each other, such as audio to image, or it is not possible because incompatibility between programs, caused by closed file formats, very limited support etc.
If you find entry that you feel is flagged as bad wrongly, please tell us in the discussion below with as much as information as possible so we can fix it.