ConvertDOS1_IMG

This tool converts IBM DOS 1.x IMG files into files that can be read with WinImage and other software.

It replaces the first 32 bytes with the following:
EB 27 90 49 42 4D 20 31 2E 30 20 00 02 01 01 00 02 40 00 40 01 FE 01 00 08 00 01 00 00 00 00 00

Source: How to mount a 160K disk img formatted in IBM DOS 1.1 format

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BaseConverter

VB.Net port of Base Converter - A simple numeric base conversion utility

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