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Microsoft C 5.0 Optimizing Compiler (5.25) is incomplete unfortunately. PACKING.LST in Setup Disk.img lists nine diskettes in the set but there are only four in the 7z archive.
Yes, that's right.
Total disks should be nine.
I wrote about information of 9 disks on the link.
I have added a note. Thanks for testing these and pointing this out.
Microsoft C Optimizing Compiler 5.0 Users Guide is available in PDF format from https://www.pcjs.org/pubs/pc/software/tools/microsoft/c/5.00/
Microsoft C Optimizing Compiler 5.1 (Update) documentation is available in PDF format from https://www.pcjs.org/pubs/pc/software/tools/microsoft/c/5.10/
There's a pdf dump at the os2museum which includes some Microsoft C (5.x) documentation: http://www.os2museum.com/wp/os2-history/os2-library/os2-1-x-sdk/