FileInfo.com - The File Extensions Resource

.BMC File Extension

File Type 1	Embroidery Image File (Most common)
File Format	File
Common?	No
File Description	Generic embroidery file format used to display the stitching patterns used by sewing machines.
Program(s) that open bmc files	Mac: XnView Windows: Bitshelter PhotoShelter; XnView

File Type 2	Bitmap Cache File
File Format	File
Common?	No
File Description	Cached bitmap image saved by Windows Remote Desktop Client (part of Terminal Services); provides a substantial performance improvement (especially over low-bandwidth connections) by caching images so they do not have to be repeatedly downloaded. Typically found in the [User Profile]\Local Settings\Application Data\Microsoft\Terminal Server Client\Cache directory.
Program(s) that open bmc files	Windows: Microsoft Windows Remote Desktop

Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/bmc