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This is the maximum number of characters, usually including a null terminator, of a standard fully-pathed filename for most Windows API functions that operate on filenames (and a few .NET ones, such as Assembly.LoadFrom). Those that fill a buffer with a filename, such as GetTempFileName, expect a buffer of exactly this length. Some functions, such as CreateFile, can be made to accept longer filenames by using the "\\?\" syntax.

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Summary

The GetTempFileName API

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static extern uint GetTempFileName(string lpPathName, string lpPrefixString,

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/// The GetTempFileName and GetTempFolderName methods (and overloads) provide

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/// the same level of convenience as the managed Path.GetTempFileName (including

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  static extern uint GetTempFileName(string lpPathName, string lpPrefixString, uint uUnique, [Out] StringBuilder lpTempFileName);

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  public static string GetTempFileName() {

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    return GetTempFileName("tmp");

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  public static string GetTempFileName(string prefix) {

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    return GetTempFileName(prefix, 0);

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  public static string GetTempFileName(string prefix, uint unique) {

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    return GetTempFileName(prefix, unique, Path.GetTempPath());

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  public static string GetTempFileName(string prefix, uint unique, string basePath) {

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    // 'sb' needs >0 size else GetTempFileName throws IndexOutOfRangeException.  260 is the most you'd want.

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    uint result = GetTempFileName(basePath, prefix, unique, sb);

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    string tempFolderName = GetTempFileName(prefix, unique, basePath);

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string tempFile = Win32Utility.GetTempFileName();

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Public Shared Function GetTempFileName() As String

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public static string GetTempFileName();

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public: static String* GetTempFileName();

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public static function GetTempFileName() : String;

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Documentation

[GetTempFileName] on MSDN

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         lngRet = GetTempFileName(astrFoldername, astrPrefix, 0, tempName)