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A .UPKG file is a simple text file that the UnrealScript compiler will look for to know what initial PackageFlags to use for the compiling package, the file must be placed within the Classes folder.

The content of a .UPKG looks like

[Flags]
AllowDownload=False
ClientOptional=False
ServerSideOnly=True

this would flag the package as don't send the package to any clients that request it from the server and flag the package as ServerSideOnly which means only the server may load this package.

The default flag values are

[Flags]
AllowDownload=True
ClientOptional=False
ServerSideOnly=False
Declarations Preprocessor • Classes • Interfaces • Cpptext • Constants • Enums • Structs • Variables (Metadata) • Replication block • Operators • Delegates • Functions • States • Defaultproperties (Subobjects)
Types bool • byte • float • int • name • string • Object • Class • Enums • Structs (Vector ⋅ Rotator ⋅ Quat ⋅ Color) • Static arrays • Dynamic arrays • Delegates • Typecasting
Literals Boolean • Float • Integer • Names • Objects (None ⋅ Self) • Vectors • Rotators • Strings
Flow GoTo • If • Assert • Return • Stop • Switch • While • Do...Until • For • ForEach • Break • Continue
Specifiers Super • Global • Static • Default • Const
UnrealScript Syntax • .UC • .UCI • .UPKG • Comments • #directives • Native

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2022-11-18T06:48:09.741728Z 2010-04-22T04:20:47Z Eliot Rewrote the article. https://wiki.beyondunreal.com/UPKG File Attribution-NonCommercial-ShareAlike 3.0