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What is a drf file why is there a problem creating it

Question: I just ran in a problem rebuilding the latest version of the TMultiLang package. This is done by a batch file which invokes the commandline compiler DCC32.EXE I got this error message: E:\Projects\MultiLang\mle>dcc32 multilang.dpk Delphi for Win32 Version 10.0 Copyright (c) 1983,97 Borland International MultiLang.dpk(40) Fatal: Could not create output file 'MultiLang.drf' What is this DRF file? Why did I get this message? Answer: When you compile with packages, you can specify which packages should be considered for linkage. The package requirements of the project get stored into a temporary Windows resource file with a .DRF extension. In my case I got this error message from DCC32 because my environment variable %TEMP% pointed to an not existing directory after I had cleaned up too much :-)