When you send a layout from EasyGigahoop to either the MC10000 or to a PC Card, the program first constructs temporary files containing the two combined designs for each side of the Gigahoop. These temporary files are stored on the last drive used to import designs into the layout. If that drive happens to be a CD-ROM drive, the operation fails because a CD-ROM is a read-only device that cannot be written on. The error message will reference the temporary file name assigned by Windows, which only adds to the confusion. There are 2 ways to resolve this problem:

1. After completing your layout, import an additional design from drive C. What design you import is irrelevant, because as soon as you have finished importing it, you will delete it using the trash can icon. The reason for this illogical maneuver is to establish drive C as the last drive used. That causes the temporary files to be written to C, which is not read-only, and everything works as expected.
2. Copy the designs you will be using from the CD-ROM onto your C drive. Then import them from there. This solves the problem, but wastes a bit of space. When you attempt to delete these files after you have created your layout, you may be surprised to find that you cannot because they are marked as "Read only." To delete them you must right-click the file, or folder, choose Properties and uncheck the "Read only" property.