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P4 Server Administration Documentation | 2025.1

# Support for long file names

Support for long file names is enabled by default in P4 Server versions 2015.2 or later. For older versions of P4 Server, you can enable long filename support on the server with the `filesys.windows.lfn` configurable.

The server root or client root cannot be a long path.

Set `filesys.windows.lfn` to `1` to support filenames longer than 260 characters on Windows platforms. A file name length of up to 32,767 characters is allowed. Each component of the path is limited to 255 characters.

To set on the server, use a command like the following:

    C:\> p4 configure set filesys.windows.lfn=1

Depending on the depth of your workspace path, you might also need to set this configurable on the client and/or proxy (which acts as a client). To set the configurable for a proxy, use a command like the following:

    C:\> p4 set -S "Perforce Proxy" P4DEBUG=filesys.windows.lfn=1

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