.HDM File Extension
File TypeHDML File
What is an HDM file?
Web page written in the Handheld Device Markup Language (HDML); designed for portable electronic devices, such as smartphones and PDAs; HDML files are transferred to devices using HDTP (the Handheld Device Transport Protocol) rather than HTTP, which is used for .HTML pages.
HDML files commonly use the .HDML file extension.