MicroType Pro document file
File type: Document file
Files with the .kos file extension are document files used by MicroType Pro learning software. They store document data created in the program.
File type category:
Document file
Date updated: November 4, 2026
The .kos file extension is associated with MicroType Pro, a learning program for practising typing on a typewriter or computer keyboard. A .kos file stores a document created in MicroType Pro.
MicroType Pro is a discontinued product, so the format may no longer be supported by current software.
Open a .kos file with MicroType Pro. Because the program is discontinued, an existing installation or original installation media may be required.
If MicroType Pro is not available, there may be no current application that can open this format correctly.
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