agFM v1.75 released (bugfix for Windows ISOs not booting in Legacy mode)

I accidentally introduced a Legacy Windows ISO problem in agFM v1.73 and v1.74.

In an attempt to fix a grub2 bug involving the loopback command which caused a problem on some PCs, I changed the windows iso code to load some required uncompressed files instead of compressed .xz files. Unfortunately, although this worked for UEFI mode, it seems it does not work for Legacy mode (for some strange reason - must be a grub2 bug?).

I have therefore changed back the grub2 code to load the compressed .xz files if grubfm is booted in Legacy mode. 

i.e this code

loopback wimboot (${user})/boot/grubfm/wimbootxz;

loopback install (${user})/boot/grubfm/installxz;

works in UEFI mode but for some strange reason not in MBR\Legacy mode!