Tandy 1000 MS-DOS Reference Manual page 40

Chapter
4
Batch Files
•
In a batch file, you may want to refer to a file whose
name contains a percent sign. For example, you may
want to include a command that copies a file called
Abco/c.exe. As you know, the batch file normally inter-
prets the percent sign as a replaceable parameter. To
indicate that this is not the case, you must include a
second percent sign. The batch file command, then,
might be this:
copya:\user\abc%%.exe b:\user
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