Oss1.part1.rar
Multi-part RAR files won't open correctly unless every single part is in the same folder. If you need help with how to extract these files or if "OSS" refers to a specific "Open Source Software" project you're working on, let me know!
"Hi [Name], I’m sending over the first part of the archive: . Please make sure to download all subsequent parts (part2, part3, etc.) into the same folder before attempting to extract them using WinRAR or 7-Zip." Option 2: Professional Documentation/ReadMe oss1.part1.rar
Use this if you are emailing or messaging the file to someone. Multi-part RAR files won't open correctly unless every