A file I/O operation is initiated to store a result of a file I/O operation in a destination file. In response to the file I/O operation being in progress, an amount of the file I/O operation currently completed is monitored. In response to determining that the amount of the file I/O operation currently completed is less than a threshold amount, another destination file is specified through a user interface, in which to store a result of file I/O operation not yet completed. The file I/O operation stores the remaining result of the file I/O operation at the another destination file. A single file handle is updated for the result of the file I/O operation to reference the destination file comprising the portion of the result and the another destination file comprising the remaining result.