- Path must not contain whitespace characters.
- Path must be at least 2 characters long.
- Path must start with a backslash.
- Path must not end with a backslash.
- Path components must not end with a dot.
CORE-9529
This avoids the open failing on certain file systems where GENERIC_WRITE access would be denied
for a readonly file.
This is an addendum to 82f44a2.
CORE-14158
In such situation, try to drop the readonly attribute before overwritting the file.
This fixes setup not being able to overwrite FAT bootcode when reusing a FAT partition
already installed without reformatting.
CORE-14158
