It sounds like you’re referencing a specific software bundle or filename, possibly from an old download source or forum post. Here’s the likely story behind that string of terms:
Microsoft Project is a separate application for project management. It was not included in standard Office 2007 suites (Home & Student, Basic, Standard, Professional, Ultimate). Project 2007 was sold as a standalone product or part of certain volume license editions. Portable Microsoft Office 2007 NL Project 2007 64 Bit
This usually means a modified version of Microsoft Office designed to run from a USB drive without installation. Microsoft never officially released a portable version of Office 2007. Any “portable” copy online is unofficial, often cracked, and may contain malware. It sounds like you’re referencing a specific software
“NL” stands for Dutch (Nederlands). This would be the Dutch language version of Office 2007. Microsoft did release official language packs, so a Dutch copy could be legitimate if obtained from MSDN or a volume license. Project 2007 was sold as a standalone product