Passing windows slash (/) based parameters to a program from bash script

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Since my comment actually provided the answer, I’ll post it.

How about escaping a forward slash to another forward slash like //. It works for me when I execute this command where I escaped the /r parameter:
start C:/folder/beep 2000 250 100 //r 3

Source: http://oldwiki.mingw.org/index.php/switches%20with%20forward%20slashes

Minimalist GNU for Windows

Passing switches with forward slashes under MSYS

In MSYS a command line argument of “/c” is interpreted as the C:
drive, so to pass any argument beginning with a forward slash you need
to use two forward slashes. For example, to use this command in MSYS:

cmd /c echo foo

Use:

cmd //c echo foo

If you need to have the windows-style of a path in a shell script, you
can do

x=$(cd /unix/path && cmd //c cd)

The x var now contains the windows equivalent path to /unix/path

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