I have been working on a machine learning project which detects malware. I have downloaded malicious files and tested my model and I was looking for a place which would contain about 50-60 non-malicious .EXE files.
You can search google by filetype, so if any of these filetypes are appropriate
You can use the filetype: operator in Google Search to limit results to a specific file type. For example, filetype:rtf galway will search for RTF files with the term "galway" in them.
Then just right-click on each result, to save locally. For 50 files, this is an easy way to get diverse file formats.
FFIEC.gov offers Home Disclosure Mortgage Act exes: HDMA exe files
Not 50-60, but a definitive, non-malicious start to building your dataset.
Description of exes: 'HMDA LAR & TS Raw Data Windows Application This software includes the loan-level data, documentation, and a tool to query and export the data.'