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FileSystem

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\FileSystem

Some values under this registry key are:

• DisableDeleteNotification
• FilterSupportedFeaturesMode
• LongPathsEnabled
• NtfsAllowExtendedCharacter8dot3Rename
• NtfsBugcheckOnCorrupt
• NtfsDisable8dot3NameCreation
• NtfsDisableCompression
• NtfsDisableEncryption
• NtfsDisableLastAccessUpdate
• NtfsDisableLfsDowngrade
• NtfsDisableVolsnapHints
• NtfsEncryptPagingFile
• NtfsMemoryUsage
• NtfsMftZoneReservation
• NtfsQuotaNotifyRate
• RefsDisableLastAccessUpdate
• ScrubMode
• SymlinkLocalToLocalEvaluation
• SymlinkLocalToRemoteEvaluation
• SymlinkRemoteToLocalEvaluation
• SymlinkRemoteToRemoteEvaluation
• UdfsCloseSessionOnEject
• UdfsSoftwareDefectManagement
• Win31FileSystem
• Win95TruncatedExtensions
• LongPathsEnabled

Beginning with Windows 10 (Version 1607), setting LongPathsEnabled to 1 apparently allows to have filenames longer than 255 or 260.
As soon as a process performs a call to a Win32 file or directory function, the set value will be cached on a per process basis.
During the lifetime of a process, the value won’t be re-read.
The value can also be modified with Group Policy at Computer Configuration -> Administrative Templates -> System -> Filesystem -> Enable NTFS long paths
See also Maximum length of path names