You are watching: This program cannot be run in dos mode
Why have this text in .dll files?
A dll is very much like an executable with a different extension. The text you saw is part of the "standard" executable header on windows. It is (was) used to gracefully abort the attempt to run a windows executable from DOS.
The Portable Executable format specification states the following:
The MS-DOS stub is a valid application that runs under MS-DOS. It is placed at the front of the EXE image. The linker places a default stub here, which prints out the message “This program cannot be run in DOS mode.” when the image is run in MS-DOS. The user can specify a different stub by using the /STUB linker option.
At location 0x3c, the stub has the file offset to the PE signature. This information enables Windows to properly execute the image file, even though it has an MS-DOS stub. This file offset is placed at location 0x3c during linking.
Win32 programs run from DOS mode (ie, single user, no graphics) print that text. DLLs probably print that message too if you try to use them without Windows running.
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