Versions

8.15.10.2869	5.32%
8.15.10.2702	15.96%
8.15.10.2702	1.06%
8.15.10.2702	3.19%
8.15.10.2555	5.32%
8.15.10.2302	11.70%
8.15.10.2226	1.06%
8.15.10.2202	11.70%
8.15.10.2189	7.45%
8.15.10.2182	3.19%
8.15.10.2141	1.06%
8.15.10.2125	2.13%
8.15.10.2119	10.64%
8.15.10.2104	3.19%
8.15.10.2086	8.51%
8.15.10.2025	1.06%
8.15.10.2008	1.06%
8.15.10.1995	1.06%
8.15.10.1986	3.19%
8.15.10.1968	2.13%

igd10umd64.dll has 20 known versions, the most recent one is 8.15.10.2869. The average file size is about 4.34 MB. It is an authenticode code-signed executable issued to MsProdMediaPeSigningSha1 by the certification authority Microsoft Digital Media Subordinate CA 2012. This is a .NET Common Language Runtime (CLR) assembly.

LDDM User Mode Driver for the Intel Graphics Media Accelerator, or GMA, is a series of Intel integrated graphics processors built into various motherboard chipsets. These integrated graphics products allow a PC to be built without a separate graphics card, which can reduce cost, power consumption and noise. They rely on the a PC's main memory for storage, which imposes a performance penalty, as both the CPU and GPU have to access memory over the same bus.