MODEM7 changed this behavior only slightly, by sending the filename, in 8.3 filename format, before the <SOH>. Each character was sent individually and had to be echoed by the receiver as a form of error correction. For a non-aware XMODEM implementation, this data would simply be ignored while it waited for the SOH to arrive, so the characters would not be echoed and the implementation could fall back to conventional XMODEM. With "aware" software, the file name could be used to save the file locally. Transfers could continue with another <NAK>, each file is saved under the name being sent to the receiver.